diff --git a/README.md b/README.md
index 1aa8256..7f6b1b7 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,14 @@ end
 
 Idioms
 ------
+### Index
+- [General](#general)
+- [Array](#array)
+- [Enumerable](#enumerable)
+- [Hash](#hash)
+- [Proc & Block](#proc--block)
+- [String](#string)
+- [Range](#range)
 
 ### General