diff --git a/runtime/doc/insert.txt b/runtime/doc/insert.txt
index 2f8e306339..0453b6f70d 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 Sep 10
+*insert.txt*    For Vim version 9.1.  Last change: 2025 Sep 11
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1164,8 +1164,8 @@ This enables automatic completion with suggestions from the current buffer,
 other windows, and listed buffers, displayed in a popup menu.  Each source is
 limited to 5 candidates.  <Tab> and <S-Tab> move through the items when the
 menu is visible.  Optionally, add "preinsert" to 'completeopt' to insert the
-longest common prefix automatically.  You can also add other completion
-sources to 'complete' as needed.
+longest common prefix automatically.  Additional sources (e.g., LSP clients)
+may be added to 'complete' to improve completion as required.
 
 See also 'autocomplete', 'autocompletedelay' and 'autocompletetimeout'.
 
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 7d891a1cfc..2be98a419b 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -2164,8 +2164,9 @@ A jump table for the options with a short description can be found at |Q_op|.
 		is especially important for |ins-autocompletion|.
 	F	equivalent to using "F{func}", where the function is taken from
 		the 'completefunc' option.
-	o	equivalent to using "F{func}", where the function is taken from
-		the 'omnifunc' option.
+	o	equivalent to "F{func}", where {func} is taken from the 'omnifunc'
+		option.  If a plugin (such as an LSP client) defines 'omnifunc', it
+		can be used through this flag.
 
 	Unloaded buffers are not loaded, thus their autocmds |:autocmd| are
 	not executed, this may lead to unexpected completions from some files