diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 1b39b1b..a34c63a 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2025 Jan 05
+*builtin.txt*	For Vim version 9.1.  Last change: 2025 Jan 06
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -5002,12 +5002,12 @@
 		Returns the current stack trace of Vim scripts.
 		Stack trace is a |List|, of which each item is a |Dictionary|
 		with the following items:
-		    funcref	The funcref if the stack is at the function,
-				otherwise this item is not exist.
+		    funcref	The funcref if the stack is at a function,
+				otherwise this item is omitted.
 		    event	The string of the event description if the
-				stack is at autocmd event, otherwise this item
-				is not exist.
-		    lnum	The line number of the script on the stack.
+				stack is at an autocmd event, otherwise this
+				item is omitted.
+		    lnum	The line number in the script on the stack.
 		    filepath	The file path of the script on the stack.
 
 		Return type: list<dict<any>>