diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc
index 3f9526c788..87056b79f0 100644
--- a/src/corelib/global/qnamespace.qdoc
+++ b/src/corelib/global/qnamespace.qdoc
@@ -2562,6 +2562,7 @@
     \value ItemIsEnabled The user can interact with the item.
     \value ItemIsTristate The item is checkable with three separate states.
     \value ItemNeverHasChildren The item never has child items.
+           This is used for optimization purposes only.
 
     Note that checkable items need to be given both a suitable set of flags
     and an initial state, indicating whether the item is checked or not.