diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 62d6ded..e9c94aa 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2024 Jun 19
+*options.txt*	For Vim version 9.1.  Last change: 2024 Jul 06
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -5918,6 +5918,20 @@
 		    (without "unsigned" it would become "9-2019").
 		    Using CTRL-X on "0" or CTRL-A on "18446744073709551615"
 		    (2^64 - 1) has no effect, overflow is prevented.
+	blank	If included, treat numbers as signed or unsigned based on
+		preceding whitespace. If a number with a leading dash has its
+		dash immediately preceded by a non-whitespace character (i.e.,
+		not a tab or a " "), the negative sign won't be considered as
+		part of the number.  For example:
+		    Using CTRL-A on "14" in "Carbon-14" results in "Carbon-15"
+		    (without "blank" it would become "Carbon-13").
+		    Using CTRL-X on "8" in "Carbon -8" results in "Carbon -9"
+		    (because -8 is preceded by whitespace. If "unsigned" was
+		    set, it would result in "Carbon -7").
+		If this format is included, overflow is prevented as if
+		"unsigned" were set. If both this format and "unsigned" are
+		included, "unsigned" will take precedence.
+
 	Numbers which simply begin with a digit in the range 1-9 are always
 	considered decimal.  This also happens for numbers that are not
 	recognized as octal or hex.
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index b60f386..d70c3b1 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2024 Jun 20
+*version9.txt*  For Vim version 9.1.  Last change: 2024 Jul 06
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41574,6 +41574,8 @@
 - the default for 'commentstring' contains whitespace padding to have
   automatic comments look nicer |comment-install|
 - 'completeopt' is now a |global-local| option.
+- 'nrformat' accepts the new "blank" suboption, to determine a signed or
+  unsigned number based on whitespace in front of a minus sign.
 
 							*added-9.2*
 Added ~