diff --git a/html.html.markdown b/html.html.markdown
index 3c855b5c..6516e5dd 100644
--- a/html.html.markdown
+++ b/html.html.markdown
@@ -111,7 +111,7 @@ This article is concerned principally with HTML syntax and some useful tips.
 
 ## Usage
 
-HTML is written in files ending with `.html`.
+HTML is written in files ending with `.html` or `.htm`. The mime type is `text/html`.
 
 ## To Learn More