diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 781f8eb..29cc506 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 8.2.  Last change: 2022 May 10
+*builtin.txt*	For Vim version 8.2.  Last change: 2022 May 21
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
diff --git a/runtime/doc/indent.txt b/runtime/doc/indent.txt
index 2899fc5..4df0909 100644
--- a/runtime/doc/indent.txt
+++ b/runtime/doc/indent.txt
@@ -1,4 +1,4 @@
-*indent.txt*    For Vim version 8.2.  Last change: 2022 Apr 07
+*indent.txt*    For Vim version 8.2.  Last change: 2022 May 21
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index b435919..f1038af 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 8.2.  Last change: 2022 May 07
+*options.txt*	For Vim version 8.2.  Last change: 2022 May 21
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
diff --git a/runtime/doc/os_win32.txt b/runtime/doc/os_win32.txt
index 6fe56c0..62376c7 100644
--- a/runtime/doc/os_win32.txt
+++ b/runtime/doc/os_win32.txt
@@ -1,4 +1,4 @@
-*os_win32.txt*  For Vim version 8.2.  Last change: 2022 Feb 14
+*os_win32.txt*  For Vim version 8.2.  Last change: 2022 May 22
 
 
 		  VIM REFERENCE MANUAL    by George Reilly
@@ -42,6 +42,11 @@
 
 For compiling see "src/INSTALLpc.txt".			*win32-compiling*
 
+							*WSL*
+When using Vim on WSL (Windows Subsystem for Linux) the remarks here do not
+apply, `has('win32')` will return false then.  In case you need to know
+whether Vim is running on WSL you can use `exists('$WSLENV')`.
+
 ==============================================================================
 1. Known problems					*win32-problems*
 
diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index d2a5dbd..fa2cded 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -1,4 +1,4 @@
-*todo.txt*      For Vim version 8.2.  Last change: 2022 May 21
+*todo.txt*      For Vim version 8.2.  Last change: 2022 May 22
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -38,20 +38,14 @@
 							*known-bugs*
 -------------------- Known bugs and current work -----------------------
 
-Make :defcompile accept a function argument, like :disassemble
-Useful for global functions.
-
-Once Vim9 is stable:
+Prepare for Vim 9.0 release:
 - Use Vim9 for more runtime files.
-- Check code coverage, add more tests if needed.
+- Check Vim9 code coverage, add more tests if needed.
 	vim9instr.c
 	vim9script.c
 	vim9type.c
-- Inlude new set of colors: #9795
 - Adjust intro message to say "help version9".
 
-Graduate FEAT_CINDENT and FEAT_SMARTINDENT ?
-
 Update the user manual:
 - Update usr_41.txt for Vim9 script
 - Fill usr_50.txt as an "advanced section" of usr_41.txt
diff --git a/runtime/doc/usr_52.txt b/runtime/doc/usr_52.txt
index 1fbd66f..375fa5d 100644
--- a/runtime/doc/usr_52.txt
+++ b/runtime/doc/usr_52.txt
@@ -1,4 +1,4 @@
-*usr_52.txt*	For Vim version 8.2.  Last change: 2022 May 16
+*usr_52.txt*	For Vim version 8.2.  Last change: 2022 May 21
 
 		     VIM USER MANUAL - by Bram Moolenaar
 
@@ -113,36 +113,33 @@
 Legacy Vim script only checks types at runtime, when the code is executed.
 And it's permissive, often a computation gives an unexpected value instead of
 reporting an error.  Thus you can define a function and think it's fine, but
-see a problem only later when it is called: >
-	let s:collected = ''
-	func ExtendAndReturn(add)
-	   let s:collected += a:add
-	   return s:collected
+notice a problem only later when the function is called: >
+	func Concatenate(base, add)
+	   return a:base + a:add
 	endfunc
 
 Can you spot the error?  Try this: >
-	echo ExtendAndReturn('text')
-And you'll see zero.  Why?  Because in legacy Vim script "+=" will convert the
-arguments to numbers, and any string without a number results in zero!
+	echo Concatenate('base', 'text')
+And you'll see zero.  Why?  Because in legacy Vim script "+" will convert the
+arguments to numbers, and any string without a number results in zero!  That's
+not what you expected.
 
-With `:def` the type checking happens when compiling the function.  For that
-you need to specify the argument types and the return type.  Also notice that
-the argument is used without the "a:" prefix: >
-	let s:collected = ''
-	def ExtendAndReturn(add: string): string
-	   s:collected += add
-	   return s:collected
+With `:def` the type checking happens when compiling the function.  You need
+to specify the argument types and the return type to make that possible.  Also
+notice that the argument names are used without the "a:" prefix: >
+	def Concatenate(base: string, add: string): string
+	   return base + add
 	enddef
-	disassemble ExtendAndReturn
+	defcompile Concatenate
 
-Here we use `:disassemble` to do the compilation right away, without it the
-compilation would happen when the function is called.  Vim will tell you what
-you did wrong: >
+Here we use `:defcompile` to do the compilation right away, without it the
+compilation would happen when the function is first called.  Vim will tell you
+what you did wrong: >
 	E1051: Wrong argument type for +
 
-Side note: here the context is legacy script, when using Vim9 script you would
-put `:defcompile` at the end of the script to check for errors in the
-functions defined in it.
+Side note: here the context is legacy script.  When using Vim9 script you
+would put `:defcompile` at the end of the script to check for errors in all
+the functions defined in it.
 
 Vim9 script is strict, it uses the "+" operator only for numbers and floats.
 For string concatenation ".." must be used.  This avoids mistakes and avoids
diff --git a/runtime/doc/various.txt b/runtime/doc/various.txt
index 8bfaeae..d09dac4 100644
--- a/runtime/doc/various.txt
+++ b/runtime/doc/various.txt
@@ -1,4 +1,4 @@
-*various.txt*   For Vim version 8.2.  Last change: 2022 Apr 03
+*various.txt*   For Vim version 8.2.  Last change: 2022 May 21
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt
index 479edc5..069dac4 100644
--- a/runtime/doc/vim9.txt
+++ b/runtime/doc/vim9.txt
@@ -1,4 +1,4 @@
-*vim9.txt*	For Vim version 8.2.  Last change: 2022 May 13
+*vim9.txt*	For Vim version 8.2.  Last change: 2022 May 21
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar