diff -urP mkws/4.0.0/mkws/README mkws/4.0.1/mkws/README
--- mkws/4.0.0/mkws/README	Wed Sep  9 19:29:21 2020
+++ mkws/4.0.1/mkws/README	Thu Sep 10 00:56:22 2020
@@ -16,19 +16,20 @@
 
 ## Installation (applies to [Linux](https://kernel.org))
 
-You'll have to download [https://mkws.sh/mkws@4.0.0.tgz](
-https://mkws.sh/mkws@4.0.0.tgz). Once you have the archive, unpack
+You'll have to download [https://mkws.sh/mkws@4.0.1.tgz](
+https://mkws.sh/mkws@4.0.1.tgz). Once you have the archive, unpack
 it and rename the newly created directory:
 
 	mkdir -p ~/src/
 	cd ~/src/
-	tar -xzfv ~/Downloads/mkws@4.0.0.tgz
+	tar -xzfv ~/Downloads/mkws@4.0.1.tgz
 	mv ws.sh example.com
 
 ## Make web site
 
 Create an `index.upphtml` file, it will be preprocessed with
-[`pp(1)`](https://mkws.sh/pp.html), and run `./bin/mkws` with the url of your web site:
+[`pp(1)`](https://mkws.sh/pp.html), and run `./bin/mkws` with the url
+of your web site:
 
 	cd example.com
 	cat <<EOF > index.upphtml
@@ -44,3 +45,18 @@
 layout file is held in `./share/l.upphtml`.
 
 Also, you can always modify your `./bin/mkws` script, if it's the case.
+
+## Important!
+
+Because [`pp(1)`](https://mkws.sh/pp.html) uses
+[`sh(1)`](
+https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sh.html)
+internally, double quotes (`"`) must be escaped in templates, so to get
+an actual double quote (`"`) you have to write `\"`. This isn't a
+problem for `HTML` because [double quoting(`"`) attribute values is
+optional and double quotes (`"`) and single quotes(`'`) are
+interchangeable](
+https://html.spec.whatwg.org/multipage/syntax.html#attributes-2).
+We recommend not quoting attribute values and using single quotes (`'`)
+in special cases.
+**
diff -urP mkws/4.0.0/mkws/mkws.1 mkws/4.0.1/mkws/mkws.1
--- mkws/4.0.0/mkws/mkws.1	Wed Sep  9 19:29:21 2020
+++ mkws/4.0.1/mkws/mkws.1	Thu Sep 10 00:56:22 2020
@@ -69,10 +69,6 @@
 ,
 .Em body
 elements.
-.It Pa $MKWSTHEMEDIR/robots.upptxt
-The
-.Pa robots.txt
-template.
 .It Pa $MKWSTHEMEDIR/sitemap.xml
 The
 .Pa sitemap.txt