diff --git a/runtime/doc/testing.txt b/runtime/doc/testing.txt
index 2f6387d..26f1a8f 100644
--- a/runtime/doc/testing.txt
+++ b/runtime/doc/testing.txt
@@ -1,4 +1,4 @@
-*testing.txt*	For Vim version 9.0.  Last change: 2022 Dec 30
+*testing.txt*	For Vim version 9.0.  Last change: 2023 May 04
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -448,13 +448,14 @@
 assert_equal({expected}, {actual} [, {msg}])
 		When {expected} and {actual} are not equal an error message is
 		added to |v:errors| and 1 is returned.  Otherwise zero is
-		returned |assert-return|.
+		returned. |assert-return|
+		The error is in the form "Expected {expected} but got
+		{actual}".  When {msg} is present it is prefixed to that.
+
 		There is no automatic conversion, the String "4" is different
 		from the Number 4.  And the number 4 is different from the
 		Float 4.0.  The value of 'ignorecase' is not used here, case
 		always matters.
-		When {msg} is omitted an error in the form "Expected
-		{expected} but got {actual}" is produced.
 		Example: >
 	assert_equal('foo', 'bar')
 <		Will result in a string to be added to |v:errors|:
@@ -533,11 +534,12 @@
 assert_false({actual} [, {msg}])			*assert_false()*
 		When {actual} is not false an error message is added to
 		|v:errors|, like with |assert_equal()|.
+		The error is in the form "Expected False but got {actual}".
+		When {msg} is present it is prepended to that.
 		Also see |assert-return|.
+
 		A value is false when it is zero. When {actual} is not a
 		number the assert fails.
-		When {msg} is omitted an error in the form
-		"Expected False but got {actual}" is produced.
 
 		Can also be used as a |method|: >
 			GetResult()->assert_false()
@@ -546,14 +548,16 @@
 		This asserts number and |Float| values.  When {actual}  is lower
 		than {lower} or higher than {upper} an error message is added
 		to |v:errors|.  Also see |assert-return|.
-		When {msg} is omitted an error in the form
-		"Expected range {lower} - {upper}, but got {actual}" is
-		produced.
+		The error is in the form "Expected range {lower} - {upper},
+		but got {actual}".  When {msg} is present it is prefixed to
+		that.
 
 								*assert_match()*
 assert_match({pattern}, {actual} [, {msg}])
 		When {pattern} does not match {actual} an error message is
 		added to |v:errors|.  Also see |assert-return|.
+		The error is in the form "Pattern {pattern} does not match
+		{actual}".  When {msg} is present it is prefixed to that.
 
 		{pattern} is used as with |=~|: The matching is always done
 		like 'magic' was set and 'cpoptions' is empty, no matter what
@@ -563,8 +567,6 @@
 		Use "^" and "$" to match with the start and end of the text.
 		Use both to match the whole text.
 
-		When {msg} is omitted an error in the form
-		"Pattern {pattern} does not match {actual}" is produced.
 		Example: >
 	assert_match('^f.*o$', 'foobar')
 <		Will result in a string to be added to |v:errors|:
@@ -614,8 +616,7 @@
 		Also see |assert-return|.
 		A value is TRUE when it is a non-zero number.  When {actual}
 		is not a number the assert fails.
-		When {msg} is omitted an error in the form "Expected True but
-		got {actual}" is produced.
+		When {msg} is given it precedes the default message.
 
 		Can also be used as a |method|: >
 			GetResult()->assert_true()