diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index ab63b0e..c857fbc 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2024 Mar 13
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 Mar 14
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -7105,6 +7105,9 @@
 		    echo printf("%1$*2$.*3$f", 1.4142135, 6, 2)
 <		      1.41
 
+		You will get an overflow error |E1510|, when the field-width
+		or precision will result in a string longer than 6400 chars.
+
 							*E1500*
 		You cannot mix positional and non-positional arguments: >
 		    echo printf("%s%1$s", "One", "Two")