diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index a31d041..e2ce176 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 Dec 06
+*options.txt*	For Vim version 9.1.  Last change: 2024 Dec 07
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -5649,6 +5649,7 @@
 			milliseconds so the user has a chance to read the
 			message, use 0 to disable sleep (but then the user may
 			miss an important message).
+			The maximum value is 10000.
 
 	history:{n}	Determines how many entries are remembered in the
 			|:messages| history.  The maximum value is 10000.
diff --git a/src/message.c b/src/message.c
index 34a2692..6b994e5 100644
--- a/src/message.c
+++ b/src/message.c
@@ -1137,6 +1137,10 @@
     if (messages_history_new > 10000)
         return FAIL;
 
+    // "wait" must be <= 10000
+    if (messages_wait_new > 10000)
+        return FAIL;
+
     msg_flags = messages_flags_new;
     msg_wait = messages_wait_new;
 
diff --git a/src/testdir/gen_opt_test.vim b/src/testdir/gen_opt_test.vim
index 8bfa57d..74f5ae5 100644
--- a/src/testdir/gen_opt_test.vim
+++ b/src/testdir/gen_opt_test.vim
@@ -236,7 +236,8 @@
       \		'history:100,wait:100', 'history:0,wait:0',
       \		'hit-enter,history:1,wait:1'],
       \		['xxx', 'history:500', 'hit-enter,history:-1',
-      \		'hit-enter,history:10001', 'hit-enter']],
+      \		'hit-enter,history:10001', 'history:0,wait:10001',
+      \		'hit-enter']],
       \ 'mkspellmem': [['10000,100,12'], ['', 'xxx', '10000,100']],
       \ 'mouse': [['', 'n', 'v', 'i', 'c', 'h', 'a', 'r', 'nvi'],
       \		['xxx', 'n,v,i']],
diff --git a/src/version.c b/src/version.c
index e5d1eb1..9c29c4e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    910,
+/**/
     909,
 /**/
     908,