diff --git a/x0vncserver/Image.cxx b/x0vncserver/Image.cxx
index ef72378..d78a98e 100644
--- a/x0vncserver/Image.cxx
+++ b/x0vncserver/Image.cxx
@@ -92,6 +92,8 @@
   // fprintf(stderr, "~Image() called\n");
 
   imageCleanup.images.remove(this);
+
+  // XDestroyImage will free xim->data if necessary
   if (xim != NULL)
     XDestroyImage(xim);
 }