diff --git a/Gemfile b/Gemfile
index 22dc5f6e..5eac4288 100644
--- a/Gemfile
+++ b/Gemfile
@@ -21,6 +21,7 @@ gem 'responders', '~> 2.0'
 # choose only one
 gem 'mysql2'
 # gem 'pg'
+# gem 'sqlite3'
 
 # for tracking data changes
 gem 'paper_trail'