diff --git a/src/os_unix.c b/src/os_unix.c
index 0813cae..ff88345 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -1609,7 +1609,7 @@
 /*
  * If the X11 connection was lost try to restore it.
  * Helps when the X11 server was stopped and restarted while Vim was inactive
- * (e.g. though tmux).
+ * (e.g. through tmux).
  */
     static void
 may_restore_clipboard()