diff --git a/docs/project.json b/docs/project.json
index 66455feb..3effe9bc 100644
--- a/docs/project.json
+++ b/docs/project.json
@@ -25,7 +25,7 @@
     {
       "title": "Miscellaneous",
       "subEntries": [
-        { "title": "Upgrade from 1.x", "file": "UPGRADE-2.0md" }
+        { "title": "Upgrade from 1.x", "file": "UPGRADE-2.0.md" }
       ]
     }
   ]