; Fix last change

diff --git a/lisp/env.el b/lisp/env.el
index c2cf0888eb7b2f53381f4716e0d1d20cdea4816e..6de90385a35dcb7b3153ca2400d9d8a6a0bf8f46 100644 (file)
--- a/lisp/env.el
+++ b/lisp/env.el
@@ -68,10 +68,10 @@ with a character not a letter, digit or underscore; otherwise, enclose
 the entire variable name in braces.  For instance, in `ab$cd-x',
 `$cd' is treated as an environment variable.
 
-If WHEN-UNDEFINED is nil, references to undefined environment variables
-are replaced by the empty string; if it is a function, the function is called
-with the variable name as argument and should return the text with which
-to replace it or nil to leave it unchanged.
+If WHEN-UNDEFINED is omitted or nil, references to undefined environment
+variables are replaced by the empty string; if it is a function, the
+function is called with the variable's name as argument, and should return
+the text with which to replace it, or nil to leave it unchanged.
 If it is non-nil and not a function, references to undefined variables are
 left unchanged.