diff --git a/runtime/doc/insert.txt b/runtime/doc/insert.txt
index 5c0ebcf..f52cf40 100644
--- a/runtime/doc/insert.txt
+++ b/runtime/doc/insert.txt
@@ -1,4 +1,4 @@
-*insert.txt*    For Vim version 9.1.  Last change: 2025 Mar 09
+*insert.txt*    For Vim version 9.1.  Last change: 2025 Apr 14
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1167,6 +1167,9 @@
 	let matches = ... list of words ...
 	return {'words': matches, 'refresh': 'always'}
 <
+If looking for matches is time-consuming, |complete_check()| may be used to
+maintain responsiveness.
+
 						*complete-items*
 Each list item can either be a string or a Dictionary.  When it is a string it
 is used as the completion.  When it is a Dictionary it can contain these