--- a/man/kdenlive.1
+++ b/man/kdenlive.1
@@ -137,7 +137,16 @@
 <file.qss>   applies the Qt stylesheet to the application widgets
 .SS
 
+.SH ENVIRONMENT
+.TP
+.B KDENLIVE_RENDER_LOG
+If
+.RB $ KDENLIVE_RENDER_LOG 
+is set, a log will be written to /tmp/kdenlive_render.log.XXXXXXXX, that contains information about
+the result of calling melt, ffmpeg, etc. This can be used for debugging.
+
 .SH SEE ALSO
+.BR kdenlive_render (1).
 Please see the homepage at
 .BR http://www.kdenlive.org/
 .br