diff --git a/lib/blacklight/catalog.rb b/lib/blacklight/catalog.rb
index d2715abba8..c54f8875fd 100644
--- a/lib/blacklight/catalog.rb
+++ b/lib/blacklight/catalog.rb
@@ -48,7 +48,8 @@ def index
       end
     end
 
-    # get single document from the solr index
+    # get a single document from the index
+    # to add responses for formats other than html or json see _Blacklight::Document::Export_
     def show
       @response, @document = get_solr_response_for_doc_id params[:id]