Fix typo in comment.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/frame.h b/src/frame.h
index 9f6f2506572..364d8ffdf95 100644
--- a/src/frame.h
+++ b/src/frame.h
@@ -178,7 +178,7 @@ struct frame
      These should probably be considered read-only by everyone except
      FRAME_SAMPLE_VISIBILITY.
 
-     This two are mutually exclusive.  They might both be zero, if the
+     These two are mutually exclusive.  They might both be zero, if the
      frame has been made invisible without an icon.  */
   char visible, iconified;