diff --git a/docs/configuration.md b/docs/configuration.md
index 6af10e9..a02ed66 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -79,6 +79,16 @@ In order of precedence Errbit uses:
GITHUB_SITE_TITLE
The title to use for GitHub. This value is whatever you want displayed in the Errbit UI when referring to GitHub.
defaults to GitHub
+GOOGLE_AUTHENTICATION
+Allow google sign-in via OAuth
+defaults to true
+GOOGLE_CLIENT_ID
+Client id of your google application
+GOOGLE_SECRET
+Secret key for your google application
+GOOGLE_SITE_TITLE
+The title to use for Google. This value is whatever you want displayed in the Errbit UI when referring to Google.
+defaults to Google
EMAIL_DELIVERY_METHOD
:smtp or :sendmail, depending on how you want Errbit to send email
SMTP_SERVER
--
libgit2 0.21.2