diff --git a/src/xdisp.c b/src/xdisp.c
index 5a014e87e6c..fdb4acd71bf 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -78,8 +78,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
    At its highest level, redisplay can be divided into 3 distinct
    steps, all of which are visible in `redisplay_internal':
 
-    . decide which windows on which frames need their windows
-      considered for redisplay
+    . decide which frames need their windows to be considered for redisplay
     . for each window whose display might need to be updated, compute
       a structure, called "glyph matrix", which describes how it
       should look on display