diff --git a/core/README.md b/core/README.md
index 3f40d311..07c5d14a 100644
--- a/core/README.md
+++ b/core/README.md
@@ -1,14 +1,14 @@
-#User Guide
-
-##Introduction
-
+Introduction
+==============
 This project aims to demonstrate wasm app management and programming model of WAMR.
 
-##Build all binaries
+Build all binaries
+==============
 Execute the build.sh script then all binaries including wasm application files would be generated in 'out' directory.
 `./build.sh`
 
-###Out directory structure
+Out directory structure
+------------------------------
  <pre>
 out/
 ├── host_tool
@@ -47,7 +47,8 @@ out/
     + timer.wasm
     This application shows the timer programming model. It creates a periodic timer that prints the current expiry number in every second.
 
-##Run
+Run
+==========================
 - Enter the out directory
   `cd ./out/`
 
@@ -85,9 +86,10 @@ out/
 
   >Note: You have to manually kill the simple process by Ctrl+C after use.
 
-###Output example
+Output example
+---------------------------------
 
-####Output of simple
+**Output of simple**
 ```
 $ ./simple -s
 App Manager started.
@@ -246,7 +248,7 @@ connection lost, and waiting for client to reconnect...
 
 ```
 
-####Output of host_tool
+**Output of host_tool**
 ```
 $ ./host_tool -q