diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 4177a01..afd84c1 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 May 22
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 May 24
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -4348,6 +4348,19 @@
 		the offset of the character's first cell not included in the
 		selection, otherwise all its cells are included.
 
+		Apart from the options supported by |getregion()|, {opts} also
+		supports the following:
+
+			eol		If |TRUE|, indicate positions beyond
+					the end of a line with "col" values
+					one more than the length of the line.
+					If |FALSE|, positions are limited
+					within their lines, and if a line is
+					empty or the selection is entirely
+					beyond the end of a line, a "col"
+					value of 0 is used for both positions.
+					(default: |FALSE|)
+
 		Can also be used as a |method|: >
 			getpos('.')->getregionpos(getpos("'a"))
 <