diff --git a/lisp/mail/mail-utils.el b/lisp/mail/mail-utils.el
index 5ddcb4b7686..d7748ffe6aa 100644
--- a/lisp/mail/mail-utils.el
+++ b/lisp/mail/mail-utils.el
@@ -63,7 +63,7 @@ also the To field, unless this would leave an empty To field."
   '("RE" "R\u00c9\\.?" "FWD?" "رد" "回复" "回覆" "SV" "Antw\\.?"
   "VS" "REF" "AW" "ΑΠ" "ΣΧΕΤ" "השב" "Vá" "R" "RIF" "BLS" "RES"
   "Odp" "YNT" "ATB")
-  "List of localized \"Re:\" abbreviations in various languages.
+  "List of localized \"Re\" abbreviations in various languages.
 Each component can be a regular expression or a simple string.  Matching
 is done case-insensitively.  Used to initialize the legacy
 `rmail-re-abbrevs' and `message-subject-re-regexp' user options."
diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index 4b93f379c72..0d657aea8a1 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -537,7 +537,7 @@ Examples:
   (concat "\\("
           (string-join mail-re-regexps "\\|")
           "\\)")
-  "Regexp with localized \"Re:\" abbreviations in various languages.
+  "Regexp with localized \"Re\" abbreviations in various languages.
 Matching is done case-insensitively.
 Initialized from `mail-re-regexps', which is easier to customize."
   :set-after '(mail-re-regexps)