diff --git a/Ruby.gitignore b/Ruby.gitignore
index aa64283..5e1422c 100644
--- a/Ruby.gitignore
+++ b/Ruby.gitignore
@@ -10,6 +10,9 @@
 /test/version_tmp/
 /tmp/
 
+# Used by dotenv library to load environment variables.
+# .env
+
 ## Specific to RubyMotion:
 .dat*
 .repl_history