diff --git a/core/src/main/java/hudson/model/UpdateSite.java b/core/src/main/java/hudson/model/UpdateSite.java
index 5d9e0c1002e956d53e44f231c3cdbf2d751847de..8d1b581a06cac733901c7a623066e807c2f0ae38 100644
--- a/core/src/main/java/hudson/model/UpdateSite.java
+++ b/core/src/main/java/hudson/model/UpdateSite.java
@@ -318,6 +318,7 @@ public class UpdateSite {
     /**
      * Whether {@link #getData} might be blocking.
      */
+    // Internal use only
     boolean hasUnparsedData() {
         return data == null && getDataFile().exists();
     }