diff --git a/source/en/mongoid/docs/indexing.haml b/source/en/mongoid/docs/indexing.haml
index 8552da5a..48d2cec0 100644
--- a/source/en/mongoid/docs/indexing.haml
+++ b/source/en/mongoid/docs/indexing.haml
@@ -125,3 +125,11 @@
 :coderay
   #!ruby
   rake db:mongoid:remove_indexes
+
+%p
+  Finally, Mongoid provides a rake task to delete all and only the non-defined 
+  indexes (the ones that do not exist in the models anymore).
+
+:coderay
+  #!ruby
+  rake db:mongoid:remove_undefined_indexes