--- a/fvwm.rst	Fri Dec 11 20:18:00 2015 +0200
+++ b/fvwm.rst	Sat Dec 12 00:22:04 2015 +0200
@@ -34,6 +34,14 @@
   $ FvwmCommand -i1 send_windowlist
   $ FvwmCommand -i3 send_windowlist
 
+Debug FVWM.
+===========
+::
+
+  $ ./configure --enable-debug-msgs --enable-command-log
+  $ fvwm -D
+
+
 Perl module for FVWM.
 =====================
 ::