diff --git a/hq9+.html.markdown b/hq9+.html.markdown
index 219930b8..3f0c5fba 100644
--- a/hq9+.html.markdown
+++ b/hq9+.html.markdown
@@ -1,5 +1,6 @@
 ---
 language: HQ9+
+filename: hq9+.html
 contributors:
     - ["Alexey Nazaroff", "https://github.com/rogaven"]
 ---