diff --git a/lib/fog/core/errors.rb b/lib/fog/core/errors.rb
index <HASH>..<HASH> 100644
--- a/lib/fog/core/errors.rb
+++ b/lib/fog/core/errors.rb
@@ -68,6 +68,9 @@ An alternate file may be used by placing its path in the FOG_RC environment vari
   :vsphere_server:
   :vsphere_username:
   :vsphere_password:
+  :libvirt_username:
+  :libvirt_password:
+  :libvirt_uri:
 #
 # End of Fog Credentials File
 #######################################################
Added libvirt options to credentials error