diff --git a/extensions/markdown-basics/package.json b/extensions/markdown-basics/package.json
index b24c8594cc2..434c7e7c667 100644
--- a/extensions/markdown-basics/package.json
+++ b/extensions/markdown-basics/package.json
@@ -29,6 +29,7 @@
           ".mdtxt",
           ".mdtext",
           ".ron",
+          ".ronn",
           ".workbook"
         ],
         "filenamePatterns": [