diff --git a/README.md b/README.md
index 72e65996..0eeaec32 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,14 @@ Public singleton methods: spec/unit/#{namespace}/#{class_name}/class_methods/#{m
 Private instance  methods: spec/unit/#{namespace}/#{class_name}/*_spec.rb
 Private singleton methods: spec/unit/#{namespace}/#{class_name}/class_methods/*_spec.rb
 ```
+Symbolic operator like method are expanded. So for example ```Foo#<<``` is expanded to:
+```
+Spec/unit/foo/left_shift_operator_spec.rb
+````
+
+The full list of expansion can be found here:
+
+https://github.com/mbj/mutant/blob/master/lib/mutant/constants.rb
 
 ### --rspec-unit