diff --git a/doc-build/md034.md b/doc-build/md034.md
index 970758c2..d1823c6c 100644
--- a/doc-build/md034.md
+++ b/doc-build/md034.md
@@ -11,6 +11,11 @@ To fix this, add angle brackets around the URL or email address:
 For more info, visit <https://www.example.com/> or email <user@example.com>.
 ```
 
+If a URL or email address contains non-ASCII characters, it may be not be
+handled as intended even when angle brackets are present. In such cases,
+[percent-encoding](https://en.m.wikipedia.org/wiki/Percent-encoding) can be used
+to comply with the required syntax for URL and email.
+
 Note: To include a bare URL or email without it being converted into a link,
 wrap it in a code span:
 
diff --git a/doc/Rules.md b/doc/Rules.md
index d393a480..6e7f24a8 100644
--- a/doc/Rules.md
+++ b/doc/Rules.md
@@ -1354,6 +1354,11 @@ To fix this, add angle brackets around the URL or email address:
 For more info, visit <https://www.example.com/> or email <user@example.com>.
 ```
 
+If a URL or email address contains non-ASCII characters, it may be not be
+handled as intended even when angle brackets are present. In such cases,
+[percent-encoding](https://en.m.wikipedia.org/wiki/Percent-encoding) can be used
+to comply with the required syntax for URL and email.
+
 Note: To include a bare URL or email without it being converted into a link,
 wrap it in a code span:
 
diff --git a/doc/md034.md b/doc/md034.md
index eca0db1b..dc9c3cf6 100644
--- a/doc/md034.md
+++ b/doc/md034.md
@@ -19,6 +19,11 @@ To fix this, add angle brackets around the URL or email address:
 For more info, visit <https://www.example.com/> or email <user@example.com>.
 ```
 
+If a URL or email address contains non-ASCII characters, it may be not be
+handled as intended even when angle brackets are present. In such cases,
+[percent-encoding](https://en.m.wikipedia.org/wiki/Percent-encoding) can be used
+to comply with the required syntax for URL and email.
+
 Note: To include a bare URL or email without it being converted into a link,
 wrap it in a code span: