1 files changed, 5 insertions, 1 deletions

diff --git a/lisp/hi-lock.el b/lisp/hi-lock.el
index b02fbc905b5..ce16c924524 100644
--- a/lisp/hi-lock.el
+++ b/lisp/hi-lock.el
@@ -409,7 +409,11 @@ versions before 22 use the following in your init file:
 (defalias 'highlight-lines-matching-regexp 'hi-lock-line-face-buffer)
 ;;;###autoload
 (defun hi-lock-line-face-buffer (regexp &optional face)
-  "Set face of all lines containing a match of REGEXP to FACE.
+  "Highlight all lines that match REGEXP using FACE.
+The lines that match REGEXP will be displayed by merging
+the attributes of FACE with any other face attributes
+of text in those lines.
+
 Interactively, prompt for REGEXP using `read-regexp', then FACE.
 Use the global history list for FACE.