diff --git a/README.md b/README.md
index ce6d565..0ffa121 100644
--- a/README.md
+++ b/README.md
@@ -12,10 +12,10 @@
   2. [Basic Shell Programming](#2-basic-shell-programming)  
     2.1. [Variables](#21-variables)  
     2.2  [Array](#22-array)  
-    2.3. [String Substitution](#22-string-substitution)  
-    2.4. [Functions](#23-functions)  
-    2.5. [Conditionals](#24-conditionals)  
-    2.6. [Loops](#25-loops)  
+    2.3. [String Substitution](#23-string-substitution)  
+    2.4. [Functions](#24-functions)  
+    2.5. [Conditionals](#25-conditionals)  
+    2.6. [Loops](#26-loops)  
   3. [Tricks](#3-tricks)  
   4. [Debugging](#4-debugging)