diff --git a/README.md b/README.md
index 249c79f..b22d489 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ const Account = mongoose.model('Account', new mongoose.Schema({
     name: String, balance: Number
 }));
 ```
-## simple
+#### simple
 ```javascript
 const ACID = require('mongoose-acid');
 await ACID.make()
@@ -30,7 +30,7 @@ await ACID.make()
     .exec();
 ```
 
-## gets the value of the previous operation
+#### gets the value of the previous operation
 ```javascript
 const ACID = require('mongoose-acid');
 await ACID.make()
@@ -41,7 +41,7 @@ await ACID.make()
     .exec();
 ```
 
-## error handling
+#### error handling
 ```javascript
 const ACID = require('mongoose-acid');
 try{
@@ -57,7 +57,7 @@ try{
 }
 ```
 
-## error handling
+#### error handling
 ```javascript
 const ACID = require('mongoose-acid');
 await ACID.make()
@@ -72,7 +72,7 @@ await ACID.make()
     .exec();
 ```
 
-## not when mongoose query
+#### not when mongoose query
 ```javascript
 const ACID = require('mongoose-acid');
 await ACID.make()
@@ -85,7 +85,7 @@ await ACID.make()
     .exec();
 ```
 
-## return to the promise operation (like `Model.create` return a Promise, there's no way to inject it)
+#### return to the promise operation (like `Model.create` return a Promise, there's no way to inject it)
 ```javascript
 const ACID = require('mongoose-acid');
 await ACID.make()