diff --git a/README.md b/README.md
index c2fc10f..39f154f 100644
--- a/README.md
+++ b/README.md
@@ -381,3 +381,5 @@ Following are some of the most commonly used constraints available in SQL −
 ## 3) Date and Time Data Types
 
 ![image](https://user-images.githubusercontent.com/43011442/127271285-779bde09-bd62-4d0f-8045-4665634b6fea.png)
+
+## 4) Character Strings Data Types