diff --git a/doomsday/doc/environment.ame b/doomsday/doc/environment.ame
index e3675512e9..d07938bbee 100644
--- a/doomsday/doc/environment.ame
+++ b/doomsday/doc/environment.ame
@@ -4,4 +4,5 @@ The following environment variables are recognized by Doomsday.
 
 @deflist{
 @item{DOOMWADDIR} DOOM WAD directory.
+@item{DOOMWADPATH} Delimited set of DOOM WAD directories.
 }