diff --git a/README.md b/README.md
index f3dbeb81..b46f5b65 100644
--- a/README.md
+++ b/README.md
@@ -13,11 +13,11 @@ phasicFlow should work with every gnu compiler that implements C++17 standards.
 # How to build? 
 phasicFlow uses CMake as the build system. you need to have CMake-3.22 or higher installed on your machine. 
 
-## build for serial execution
+### build for serial execution
 
-## build for parallel execution on CPU
+### build for parallel execution on CPU
 
-## build for parallel execution on CUDA-enabled GPUs
+### build for parallel execution on CUDA-enabled GPUs
 
 # How to use phasicFlow?