diff --git a/package.json b/package.json
index 32e9f48c..9b32ff33 100644
--- a/package.json
+++ b/package.json
@@ -515,6 +515,12 @@
           "default": [],
           "markdownDescription": "An array of paths to JARs that should be contributed to the LemMinX classpath. The paths can include glob patterns. This is intended to be used as a tool for developing extensions to vscode-xml. See [here](command:xml.open.docs?%5B%7B%22page%22%3A%22Preferences%22%2C%22section%22%3A%22extension-jars%22%7D%5D) for more information",
           "scope": "window"
+        },
+        "xml.completion.fileSupport.enabled": {
+          "type": "boolean",
+          "default": true,
+          "markdownDescription": "Allows files to populate XML completion list.",
+          "scope": "window"
         }
       }
     },