diff --git a/tmux.1 b/tmux.1
index 341c2b8c..f5988c42 100644
--- a/tmux.1
+++ b/tmux.1
@@ -1362,7 +1362,7 @@ a pane ID such as
 .Ql %0 ;
 .Ql %*
 for all panes in the attached session;
-an window ID such as
+a window ID such as
 .Ql @0 ;
 or
 .Ql @*