diff --git a/yasnippet.el b/yasnippet.el
index d792065..d0cb00d 100644
--- a/yasnippet.el
+++ b/yasnippet.el
@@ -489,7 +489,8 @@ Attention: These hooks are not run when exiting nested/stackd snippet expansion!
      t)
   "Snippet expanding condition.
 
-This variable is a lisp form:
+This variable is a lisp form which is evaluated everytime a
+snippet expansion is attemped:
 
     * If it evaluates to nil, no snippets can be expanded.