diff --git a/mozilla/docshell/base/nsDocShell.cpp b/mozilla/docshell/base/nsDocShell.cpp
index cc6c367506a..8802aa27af8 100644
--- a/mozilla/docshell/base/nsDocShell.cpp
+++ b/mozilla/docshell/base/nsDocShell.cpp
@@ -8073,6 +8073,7 @@ nsDocShell::EnsureScriptEnvironment()
 
     // Ensure the script object is set to run javascript - other languages
     // setup on demand.
+    // XXX - should this be setup to run the default language for this doc?
     nsresult rv;
     nsCOMPtr<nsILanguageRuntime> languageRuntime;
     rv = factory->GetLanguageRuntimeByID(nsIProgrammingLanguage::JAVASCRIPT,