diff --git a/wmppp.app/INSTALL b/wmppp.app/INSTALL
index ae4805e..d522915 100644
--- a/wmppp.app/INSTALL
+++ b/wmppp.app/INSTALL
@@ -17,6 +17,9 @@ Requirements
 	the installation copies the GLOBAL config files
 	there, don't worry, nothing will be overwritten ;-)
 
+Make sure libdockapp (at least version 0.7.0) is installed. It
+may be obtained at
+http://windowmaker.org/dockapps/?name=libdockapp
 
 Installation
 --------------------------------------------------------------