diff --git a/src/ag-app.c b/src/ag-app.c
index 1f30506..33bfd95 100644
--- a/src/ag-app.c
+++ b/src/ag-app.c
@@ -1,3 +1,21 @@
+/* ag-app.c - Application definition for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #include <glib/gi18n.h>
 #include <webkit2/webkit2.h>
 
diff --git a/src/ag-app.h b/src/ag-app.h
index faf90aa..11b48a0 100644
--- a/src/ag-app.h
+++ b/src/ag-app.h
@@ -1,3 +1,21 @@
+/* ag-app.h - Application definition for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #ifndef __AG_APP_H__
 #define __AG_APP_H__
 
diff --git a/src/ag-chart.c b/src/ag-chart.c
index 374db08..c6c7514 100644
--- a/src/ag-chart.c
+++ b/src/ag-chart.c
@@ -1,3 +1,21 @@
+/* ag-chart.c - Chart manipulation object for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #include <errno.h>
 #include <gio/gio.h>
 #include <libxml/parser.h>
diff --git a/src/ag-chart.h b/src/ag-chart.h
index 216f5e3..fc0397a 100644
--- a/src/ag-chart.h
+++ b/src/ag-chart.h
@@ -1,3 +1,21 @@
+/* ag-chart.h - Chart manipulation object for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #ifndef __AG_CHART_H__
 #define __AG_CHART_H__
 
diff --git a/src/ag-db.c b/src/ag-db.c
index bb9fdca..f4f0c35 100644
--- a/src/ag-db.c
+++ b/src/ag-db.c
@@ -1,3 +1,21 @@
+/* ag-db.c - Database manipulation functionality for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #include <gio/gio.h>
 #include <gobject/gobject.h>
 #include <libgda/libgda.h>
diff --git a/src/ag-db.h b/src/ag-db.h
index 575d0c9..a76dcef 100644
--- a/src/ag-db.h
+++ b/src/ag-db.h
@@ -1,3 +1,21 @@
+/* ag-db.h - Database manipulation functionality for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #ifndef __AG_DB_H__
 #define __AG_DB_H__
 
diff --git a/src/ag-display-theme.c b/src/ag-display-theme.c
index 1a6d9a6..c0a08bd 100644
--- a/src/ag-display-theme.c
+++ b/src/ag-display-theme.c
@@ -1,3 +1,21 @@
+/* ag-display-theme.c - Display theme management for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #include <glib/gi18n.h>
 #include <swe-glib.h>
 
diff --git a/src/ag-display-theme.h b/src/ag-display-theme.h
index 416e003..2541530 100644
--- a/src/ag-display-theme.h
+++ b/src/ag-display-theme.h
@@ -1,3 +1,21 @@
+/* ag-display-theme.h - Display theme management for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #ifndef __AG_DISPLAY_THEME_H__
 #define __AG_DISPLAY_THEME_H__
 
diff --git a/src/ag-preferences.c b/src/ag-preferences.c
index 9a7008b..1f93684 100644
--- a/src/ag-preferences.c
+++ b/src/ag-preferences.c
@@ -1,3 +1,21 @@
+/* ag-preferences.c - Preferences dialog for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #include <gtk/gtk.h>
 #include <swe-glib.h>
 #include <stdlib.h>
diff --git a/src/ag-preferences.h b/src/ag-preferences.h
index f115d8a..2f93f02 100644
--- a/src/ag-preferences.h
+++ b/src/ag-preferences.h
@@ -1,3 +1,21 @@
+/* ag-preferences.h - Preferences dialog for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #ifndef __AG_PREFERENCES_H__
 #define __AG_PREFERENCES_H__
 
diff --git a/src/ag-settings.c b/src/ag-settings.c
index ddb560c..f4d833b 100644
--- a/src/ag-settings.c
+++ b/src/ag-settings.c
@@ -1,3 +1,21 @@
+/* ag-settings.c - Settings object for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #include "ag-settings.h"
 
 #define SETTINGS_SCHEMA_ID_MAIN   "eu.polonkai.gergely.Astrognome"
diff --git a/src/ag-settings.h b/src/ag-settings.h
index 6ce0ae9..effe947 100644
--- a/src/ag-settings.h
+++ b/src/ag-settings.h
@@ -1,3 +1,21 @@
+/* ag-settings.h - Settings object for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #ifndef __AG_SETTINGS_H__
 #define __AG_SETTINGS_H__
 
diff --git a/src/ag-window.c b/src/ag-window.c
index e33d231..a03b58a 100644
--- a/src/ag-window.c
+++ b/src/ag-window.c
@@ -1,3 +1,21 @@
+/* ag-window.c - Main window management for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #include <math.h>
 #include <string.h>
 #include <glib/gi18n.h>
diff --git a/src/ag-window.h b/src/ag-window.h
index 8bf51bf..1f70c6c 100644
--- a/src/ag-window.h
+++ b/src/ag-window.h
@@ -1,3 +1,21 @@
+/* ag-window.h - Main window management for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #ifndef __AG_WINDOW_H__
 #define __AG_WINDOW_H__
 
diff --git a/src/astrognome.c b/src/astrognome.c
index 2e8d601..e6c9757 100644
--- a/src/astrognome.c
+++ b/src/astrognome.c
@@ -1,3 +1,21 @@
+/* astrognome.c - Utility functions and main() for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #include <stdlib.h>
 #include <glib.h>
 #include <gtk/gtk.h>
diff --git a/src/astrognome.h b/src/astrognome.h
index e087a09..1501fdb 100644
--- a/src/astrognome.h
+++ b/src/astrognome.h
@@ -1,3 +1,21 @@
+/* astrognome.h - Utility functions and main() for Astrognome
+ *
+ * Copyright (C) 2014 Polonkai Gergely
+ *
+ * Astrognome is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Astrognome is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
 #ifndef __ASTROGNOME_H__
 #define __ASTROGNOME_H__