diff --git a/README.md b/README.md
index 1d265b5..b7d24b8 100644
--- a/README.md
+++ b/README.md
@@ -31,3 +31,5 @@ Theorem 2: If A is a nonzero noetherian ring, then dim A[t] = dim A + 1
 Theorem 3: If A is nonzero ring then dim A_p + dim A/p <= dim A
 
 Definition of a graded ring
+
+Definition of a graded module