diff --git a/runtime/doc/vim.1 b/runtime/doc/vim.1
index a2ca0e2..f32c067 100644
--- a/runtime/doc/vim.1
+++ b/runtime/doc/vim.1
@@ -459,6 +459,9 @@
 \-\-socketid {id}
 GTK GUI only: Use the GtkPlug mechanism to run gvim in another window.
 .TP
+\-\-startuptime {file}
+During startup write timing messages to the file {fname}.
+.TP
 \-\-version
 Print version information and exit.
 .SH ON-LINE HELP