(defcustom abbrev-mode nil
"Toggle abbrev mode.
-In abbrev mode, inserting an abbreviation causes it to expand
-and be replaced by its expansion.
-You must modify via \\[customize] for this variable to have an effect."
- :set (lambda (symbol value)
- (abbrev-mode (if value 1 0)))
+Non-nil means automatically expand abbrevs as they are inserted.
+
+This variable automatically becomes buffer-local when set in any fashion.
+Changing it with \\[customize] sets the default value.
+Use the command `abbrev-mode' to enable or disable Abbrev mode in the current
+buffer."
:type 'boolean
:group 'abbrev-mode)