diff --git a/lisp/progmodes/cperl-mode.el b/lisp/progmodes/cperl-mode.el
index 8804e83fced..d35eab15a20 100644
--- a/lisp/progmodes/cperl-mode.el
+++ b/lisp/progmodes/cperl-mode.el
@@ -6245,7 +6245,8 @@ See examples in `cperl-style-examples'.")
   "Set CPerl mode variables to use one of several different indentation styles.
 The arguments are a string representing the desired style.
 The list of styles is in `cperl-style-alist', available styles
-are CPerl, PBP, PerlStyle, GNU, K&R, BSD, C++ and Whitesmith.
+are \"CPerl\", \"PBP\", \"PerlStyle\", \"GNU\", \"K&R\", \"BSD\", \"C++\"
+and \"Whitesmith\".
 
 The current value of style is memorized (unless there is a memorized
 data already), may be restored by `cperl-set-style-back'.