diff --git a/.gitignore b/.gitignore
index 5e912d8..c86184f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@ Makefile.in
 /GTAGS
 /src/matrix-version.h
 /src/matrix-enumtypes.[ch]
+/src/matrix-marshalers.[ch]
 /docs/reference/matrix-glib/version.xml
 /docs/reference/matrix-glib/html/
 /docs/reference/matrix-glib/xml/
diff --git a/configure.ac b/configure.ac
index 367f277..65e3b01 100644
--- a/configure.ac
+++ b/configure.ac
@@ -51,6 +51,7 @@ GOBJECT_INTROSPECTION_CHECK([1.0])
 
 PKG_PROG_PKG_CONFIG
 AC_PATH_PROG([GLIB_MKENUMS], [glib-mkenums])
+AC_PATH_PROG([GLIB_GENMARSHAL], [glib-genmarshal])
 
 PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.38])
 PKG_CHECK_MODULES([GOBJECT], [gobject-2.0 >= 2.38])
diff --git a/docs/reference/matrix-glib/matrix-glib-sections.txt b/docs/reference/matrix-glib/matrix-glib-sections.txt
index 6c846ec..390e436 100644
--- a/docs/reference/matrix-glib/matrix-glib-sections.txt
+++ b/docs/reference/matrix-glib/matrix-glib-sections.txt
@@ -3,6 +3,7 @@
 <TITLE>MatrixClient</TITLE>
 MatrixClient
 MatrixClientInterface
+matrix_client_login_finished
 matrix_client_register_with_password
 matrix_client_login_with_password
 matrix_client_logout
diff --git a/src/Makefile.am b/src/Makefile.am
index 96526df..77a84b8 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -4,10 +4,10 @@ lib_LTLIBRARIES = libmatrix-glib-0.0.la
 bin_PROGRAMS = test-api-client
 
 INST_H_SRC_FILES = \
-	matrix-client.h \
 	matrix-api.h \
 	matrix-api-types.h \
 	matrix-http-api.h \
+	matrix-client.h \
 	$(NULL)
 
 INST_H_BUILT_FILES = \
@@ -21,13 +21,14 @@ matrix_enum_headers = \
 	$(NULL)
 
 libmatrix_glib_0_0_la_SOURCES = \
-	matrix-client.c \
 	matrix-version.c \
 	matrix-api.c \
 	matrix-api-types.c \
 	matrix-http-api.c \
 	matrix-enumtypes.c \
 	utils.c \
+	matrix-marshalers.c \
+	matrix-client.c \
 	$(INST_H_SRC_FILES) \
 	$(INST_H_BUILT_FILES) \
 	$(NULL)
@@ -36,7 +37,12 @@ libmatrix_glib_0_0_la_CFLAGS = $(GLIB_CFLAGS) $(GOBJECT_CFLAGS) $(SOUP_CFLAGS) $
 libmatrix_glib_0_0_la_LIBADD = $(GLIB_LIBS) $(GOBJECT_LIBS) $(SOUP_LIBS) $(JSON_LIBS)
 libmatrix_glib_0_0_la_DEPENDENCIES =
 
-BUILT_SOURCES = matrix-enumtypes.c matrix-enumtypes.h
+BUILT_SOURCES = \
+	matrix-enumtypes.c \
+	matrix-enumtypes.h \
+	matrix-marshalers.c \
+	matrix-marshalers.h \
+	$(NULL)
 
 test_api_client_SOURCES = test-api-client.c $(libmatrix_glib_0_0_la_SOURCES)
 test_api_client_CFLAGS = $(libmatrix_glib_0_0_la_CFLAGS)
@@ -46,6 +52,7 @@ CLEANFILES = $(BUILT_SOURCES)
 EXTRA_DIST = \
 	matrix-enumtypes.h.template \
 	matrix-enumtypes.c.template \
+	matrix-marshalers.list \
 	$(INST_H_SRC_FILES) \
 	$(NULL)
 
@@ -57,6 +64,17 @@ matrix-enumtypes.c: $(matrix_enum_headers) matrix-enumtypes.h matrix-enumtypes.c
 	$(AM_V_GEN) $(GLIB_MKENUMS) --template $(filter %.template,$^) $(filter-out %.template,$^) > $@.tmp \
 	&& mv $@.tmp $@
 
+matrix-marshalers.h: matrix-marshalers.list
+	$(AM_V_GEN) $(GLIB_GENMARSHAL) --prefix=_matrix_marshal $(srcdir)/matrix-marshalers.list --header --valist-marshallers >> xgen-gmlh \
+	&& (cmp -s xgen-gmlh matrix-marshalers.h || cp xgen-gmlh matrix-marshalers.h) \
+	&& rm -f xgen-gmlh
+
+matrix-marshalers.c: matrix-marshalers.list
+	$(AM_V_GEN) (echo "#include \"matrix-marshalers.h\""; \
+	$(GLIB_GENMARSHAL) --prefix=_matrix_marshal $(srcdir)/matrix-marshalers.list --body --valist-marshallers) >> xgen-gmlc \
+	&& cp xgen-gmlc matrix-marshalers.c \
+	&& rm -f xgen-gmlc
+
 include $(INTROSPECTION_MAKEFILE)
 MatrixGlib-$(MATRIX_GLIB_API_VERSION).gir: libmatrix-glib-0.0.la
 Matrix_@MATRIX_GLIB_API_VERSION_U@_gir_FILES = $(INST_H_SRC_FILES) $(INST_H_BUILT_FILES) $(filter %.c,$(libmatrix_glib_0_0_la_SOURCES))
diff --git a/src/matrix-client.c b/src/matrix-client.c
index 947b1f4..e092c03 100644
--- a/src/matrix-client.c
+++ b/src/matrix-client.c
@@ -17,6 +17,7 @@
  */
 
 #include "matrix-client.h"
+#include "matrix-marshalers.h"
 
 /**
  * SECTION:matrix-client
@@ -31,6 +32,7 @@
 
 /**
  * MatrixClientInterface:
+ * @login_finished: signal is a sign of a finished login request
  * @login_with_password: virtual function for
  *                       matrix_client_login_with_password()
  * @register_with_password: virtual function for
@@ -53,6 +55,25 @@ G_DEFINE_INTERFACE(MatrixClient, matrix_client, G_TYPE_OBJECT);
 static void
 matrix_client_default_init(MatrixClientInterface *iface)
 {
+    /**
+     * MatrixClient::login-finished:
+     * @client: a #MatrixClient
+     * @success: if %TRUE, login was successful
+     *
+     * This signal is a sign for a finished login request.
+     *
+     * Implementations of #MatrixClient are responsible for emitting
+     * this signal when they get a response for a login request.
+     *
+     * matrix_client_login_finished() is a convenience function for
+     * emitting #MatrixClient::login-finished.
+     */
+    g_signal_new("login-finished",
+                 MATRIX_TYPE_CLIENT,
+                 G_SIGNAL_RUN_LAST,
+                 G_STRUCT_OFFSET(MatrixClientInterface, login_finished),
+                 NULL, NULL, _matrix_marshal_VOID__BOOLEAN,
+                 G_TYPE_NONE, 1, G_TYPE_BOOLEAN);
 }
 
 /**
@@ -160,3 +181,18 @@ matrix_client_stop_polling(MatrixClient *client,
     MATRIX_CLIENT_GET_IFACE(client)
         ->stop_polling(client, cancel_ongoing, error);
 }
+
+/**
+ * matrix_client_login_finished:
+ * @client: a #MatrixClient
+ * @success: if %TRUE, login was successful
+ *
+ * Emits the #MatrixClient::login-finished signal.
+ */
+void
+matrix_client_login_finished(MatrixClient *client, gboolean success)
+{
+    g_return_if_fail(MATRIX_IS_CLIENT(client));
+
+    g_signal_emit_by_name(client, "login-finished", success);
+}
diff --git a/src/matrix-client.h b/src/matrix-client.h
index c13f8d4..eccac00 100644
--- a/src/matrix-client.h
+++ b/src/matrix-client.h
@@ -54,6 +54,8 @@ struct _MatrixClientInterface {
     void (*stop_polling)(MatrixClient *client,
                          gboolean cancel_ongoing,
                          GError **error);
+
+    void (*login_finished)(MatrixClient *client, gboolean success);
 };
 
 struct _MatrixClientClass {
@@ -63,6 +65,8 @@ struct _MatrixClientClass {
 
 GType matrix_client_get_type(void) G_GNUC_CONST;
 
+void matrix_client_login_finished(MatrixClient *client, gboolean success);
+
 void matrix_client_login_with_password(MatrixClient *client,
                                        const gchar *username,
                                        const gchar *password,
diff --git a/src/matrix-marshalers.list b/src/matrix-marshalers.list
new file mode 100644
index 0000000..1ac3104
--- /dev/null
+++ b/src/matrix-marshalers.list
@@ -0,0 +1 @@
+VOID:BOOLEAN