diff --git a/doc/startuptime.txt b/doc/startuptime.txt
index 17199fa..660b587 100644
--- a/doc/startuptime.txt
+++ b/doc/startuptime.txt
@@ -51,6 +51,9 @@ Arguments ~
 
 * `--hidden` prevents the output table from being generated. This may be useful
   when |:StartupTime| is being run for its side effects (see |startuptime-api|).
+* `--input-file` specifies a file with the output generated by running (n)vim
+  with the |--startuptime| argument. This can be used instead of having the
+  plugin obtain this information. The argument can't be combined with `--tries`.
 * `--sort` and `--no-sort` specify whether events are sorted.
 * `--sourcing-events` and `--no-sourcing-events` specify whether sourcing
   events are included.
@@ -68,6 +71,7 @@ Arguments ~
  >
 	:StartupTime
 	       \ [--hidden]
+	       \ [--input-file STRING]
 	       \ [--sort] [--no-sort]
 	       \ [--sourcing-events] [--no-sourcing-events]
 	       \ [--other-events] [--no-other-events]