diff --git a/README.md b/README.md
index 763bcf1..35cfe3b 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ There are three REST API modules as there are some differences in each contract
 2. `InverseFuturesClient` for inverse futures
 3. `LinearClient` for linear perpetual
 
-## REST Inverse
+### REST Inverse
 <details><summary>To use the inverse REST APIs, import the `InverseClient` Click here to expand and see full sample:</summary>
 
 ```javascript
@@ -103,7 +103,7 @@ client.getOrderBook({ symbol: 'BTCUSD' })
 
 See [inverse-client.ts](./src/inverse-client.ts) for further information.
 
-## REST Inverse Futures
+### REST Inverse Futures
 <details><summary>To use the inverse futures REST APIs, import the `InverseFuturesClient`. Click here to expand and see full sample:</summary>
 
 ```javascript
@@ -147,7 +147,7 @@ See [inverse-futures-client.ts](./src/inverse-futures-client.ts) for further inf
 
 **Note**: as of 6th March 2021 this is currently only for testnet. See the [Bybit API documentation](https://bybit-exchange.github.io/docs/inverse_futures/#t-introduction) for official updates.
 
-## REST Linear
+### REST Linear
 <details><summary>To use the Linear (USDT) REST APIs, import the `LinearClient`. Click here to expand and see full sample:</summary>
 
 ```javascript