diff --git a/extensions/markdown-basics/package.json b/extensions/markdown-basics/package.json
index dd0b3f5a87d..a81c7625531 100644
--- a/extensions/markdown-basics/package.json
+++ b/extensions/markdown-basics/package.json
@@ -17,9 +17,13 @@
 				],
 				"extensions": [
 					".md",
+          ".mkd",
+          ".mdwn",
 					".mdown",
 					".markdown",
 					".markdn",
+          ".mdtxt",
+          ".mdtext",
 					".workbook"
 				],
 				"configuration": "./language-configuration.json"
@@ -87,4 +91,4 @@
 	"scripts": {
 		"update-grammar": "node ../../build/npm/update-grammar.js microsoft/vscode-markdown-tm-grammar syntaxes/markdown.tmLanguage ./syntaxes/markdown.tmLanguage.json"
 	}
-}
\ No newline at end of file
+}