Improve documentation of 'replace-character-fold'

* lisp/replace.el (replace-character-fold): Clarify which commands
are affected by this variable.

1 files changed, 4 insertions, 2 deletions

diff --git a/lisp/replace.el b/lisp/replace.el
index a671a98b7a0..b0a14e3f44c 100644
--- a/lisp/replace.el
+++ b/lisp/replace.el
@@ -34,9 +34,11 @@
   :group 'matching)
 
 (defcustom replace-character-fold nil
-  "Non-nil means `query-replace' should do character folding in matches.
+  "Non-nil means replacement commands should do character folding in matches.
 This means, for instance, that \\=' will match a large variety of
-unicode quotes."
+unicode quotes.
+This variable affects `query-replace' and `replace-string', but not
+`replace-regexp'."
   :type 'boolean
   :group 'matching
   :version "25.1")