diff --git a/extensions/markdown-basics/package.json b/extensions/markdown-basics/package.json
index a091ad8ea291f5ae539497ff342d8f20d191c219..dd0b3f5a87d3841407f61af8d665a4af6551cc52 100644
--- a/extensions/markdown-basics/package.json
+++ b/extensions/markdown-basics/package.json
@@ -19,7 +19,8 @@
 					".md",
 					".mdown",
 					".markdown",
-					".markdn"
+					".markdn",
+					".workbook"
 				],
 				"configuration": "./language-configuration.json"
 			}