diff --git a/.gitignore b/.gitignore
index 2b30b6c..4ec27ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,4 +28,5 @@ drop-world.sh
 libtool
 nbproject/private
 conf/wmud.conf
+cscope.out
 var
diff --git a/Makefile.am b/Makefile.am
index 00990af..d042431 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,11 @@
 ACLOCAL_AMFLAGS = -I m4
 SUBDIRS = wmud docs/reference/wmud
 DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc
+
+csclean:
+	-rm -f cscope.out
+
+cscope.out:
+	cscope -bR
+
+cscope: csclean cscope.out