diff --git a/services/document-updater/app/js/DocumentManager.js b/services/document-updater/app/js/DocumentManager.js
index 9975877d05..5c0798fdfd 100644
--- a/services/document-updater/app/js/DocumentManager.js
+++ b/services/document-updater/app/js/DocumentManager.js
@@ -296,6 +296,9 @@ module.exports = DocumentManager = {
           callback(null)
         } else {
           logger.debug({ projectId, docId, version }, 'flushing doc')
+          Metrics.inc('flush-doc-if-loaded', {
+            status: unflushedTime != null ? 'modified' : 'unmodified',
+          })
           PersistenceManager.setDoc(
             projectId,
             docId,