diff --git a/lib/twitter_ebooks/model.rb b/lib/twitter_ebooks/model.rb
index 7213d79..b3bbb13 100644
--- a/lib/twitter_ebooks/model.rb
+++ b/lib/twitter_ebooks/model.rb
@@ -118,7 +118,7 @@ module Ebooks
           tweet[text_col]
         end
       else
-        log "Reading plaintext corpus from #{path}"
+        log "Reading plaintext corpus from #{path} (if this is a json or csv file, please rename the file with an extension and reconsume)"
         lines = content.split("\n")
       end