Update documentation

diff --git a/doc/17-language-reference.md b/doc/17-language-reference.md
index 4de8afbfd848da1e6956576e89f0ab9d40e4efc9..0b7ad7bbf871b982389ee321248a27309e0ec2b5 100644 (file)
--- a/doc/17-language-reference.md
+++ b/doc/17-language-reference.md
@@ -1067,6 +1067,8 @@ These keywords are reserved and must not be used as constants or custom attribut
     try
     except
     in
+    using
+    namespace
 
 You can escape reserved keywords using the `@` character. The following example
 tries to set `vars.include` which references a reserved keyword and generates