diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 3121039..9cdf9bb 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -7067,6 +7067,7 @@
 	   split	If included, split the current window before loading
 			a buffer for a |quickfix| command that display errors.
 			Otherwise: do not split, use current window.
+	   vsplit	Just like "split" but split vertically.
 	   newtab	Like "split", but open a new tab page.  Overrules
 			"split" when both are present.