diff --git a/README.md b/README.md
index cbe062a..558185b 100644
--- a/README.md
+++ b/README.md
@@ -65,7 +65,7 @@ The [key difference]() between sim-opt and other analytical tools is its [abilit
 
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-## I- Example of a [Optimization Problem]()
+# I- Example of a [Optimization Problem]()
 
 #### ➢ [Click here](https://github.com/Quantum-Software-Development/Optimization-Simulation-Modeling-LinearProgramming/blob/8e3cf8ba6bdc2ce92a011ff5169a3ec704a9d6f0/class_1-Optimization-Simulation-Modelin/1-Optimization%20and%20Simulation.pdf) to access Theoretical and Pratical Material. 
 
@@ -136,7 +136,7 @@ $$
 
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-## II- [Modeling - Writing Mathematical Models]()
+# II- [Modeling - Writing Mathematical Models]()
 
 #### [Click here](https://github.com/Quantum-Software-Development/Optimization-Simulation-Modeling-LinearProgramming/blob/6a19c6fa9a8b255e1d21bb7d2c5d1ede61f5faf1/class_2-Modeling-Writing%20Mathematical%20Model%20s/2-Optimization%20and%20Simulation%20Modeling.pdf) to access Theoretical and Pratical Material.