vimdoc.diff

diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 0d7110385..c72a7f2ba 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.2.  Last change: 2026 Sep 13
+*builtin.txt*	For Vim version 9.2.  Last change: 2026 Sep 14
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -5260,6 +5260,31 @@ getregionpos({pos1}, {pos2} [, {opts}])			*getregionpos()*
 					value of 0 is used for both positions.
 					(default: |FALSE|)
 
+			bounds		If |TRUE|, return only the outer
+					bounds of the region as a single
+					pair: >
+						[[{start_pos}, {end_pos}]]
+<					{start_pos} is the start position on
+					the first line of the region and
+					{end_pos} the end position on its
+					last line.  The lines in between are
+					not visited, which is much faster for
+					a large region.
+					(default: |FALSE|)
+
+		Using "bounds" with the same {opts} is equivalent to taking
+		the outer positions of the full result: >
+			let full = getregionpos(pos1, pos2, opts)
+			let bounds = [[full[0][0], full[-1][1]]]
+<		When the full result is empty, e.g. because {pos1} and {pos2}
+		are in different buffers, the result is empty as well.
+		Note that the two positions then come from different lines, so
+		they describe a diagonal of the region and not its shape.  For
+		a blockwise region they are the start of the first line and
+		the end of the last line, not the corners of the block.
+		Likewise, when the first line is empty and "eol" is |FALSE|,
+		{start_pos} has a "col" of 0 while {end_pos} may not.
+
 		Can also be used as a |method|: >
 			getpos('.')->getregionpos(getpos("'a"))
 <