diff --git a/README.md b/README.md
index 5e04afe..faacf07 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ This project specifies interoperability of common algebraic
 structures:
 
 * [Setoid](#setoid)
+* [Ord](#ord)
 * [Semigroup](#semigroup)
 * [Monoid](#monoid)
 * [Functor](#functor)