diff --git a/question/upgrade.txt b/question/upgrade.txt
index c06c3fb3592..ec61839325d 100644
--- a/question/upgrade.txt
+++ b/question/upgrade.txt
@@ -48,3 +48,7 @@ To add filters, local plugins can now implement the function local_[pluginname]_
    To ensure you are no longer using or defining any deprecated functions,
    search for the regular expression:
    question_rewrite_questiontext_preview_urls|_questiontext_preview_pluginfile|question_send_questiontext_file
+
+3) The arugment list for core_question_renderer::mark_summary has changed.
+   Please update your calls. (The most likely secnario for this is if you have
+   overridden core_question_renderer::info in your own renderer.)