diff --git a/README.yaml b/README.yaml
index 48ad529..8ca799d 100644
--- a/README.yaml
+++ b/README.yaml
@@ -93,7 +93,7 @@ references:
 
 # How to use this project
 usage: |-
-  ## Convert AWS region (ex.: `us-west-2`) to fixed abbreviation - will be `uw2`.
+  ### Convert AWS region (ex.: `us-west-2`) to fixed abbreviation - will be `uw2`.
   ```yaml
     name: Pull Request
     on:
@@ -116,7 +116,7 @@ usage: |-
           result: ${{ steps.aws_map.outputs.result }}
   ```
 
-  ## Convert AWS region (ex.: `us-west-2`) to short abbreviation - will be `usw2`.
+  ### Convert AWS region (ex.: `us-west-2`) to short abbreviation - will be `usw2`.
   ```yaml
     name: Pull Request
     on:
@@ -138,7 +138,7 @@ usage: |-
           result: ${{ steps.aws_map.outputs.result }}
   ```
 
-  ## Convert short AWS region (ex.: `usw2`) to long abbreviation - will be `us-west-2`.
+  ### Convert short AWS region (ex.: `usw2`) to long abbreviation - will be `us-west-2`.
   ```yaml
     name: Pull Request
     on:
@@ -160,7 +160,7 @@ usage: |-
           result: ${{ steps.aws_map.outputs.result }}
   ```
 
-  ## Convert fixed AWS region (ex.: `uw2`) to long abbreviation - will be `us-west-2`.
+  ### Convert fixed AWS region (ex.: `uw2`) to long abbreviation - will be `us-west-2`.
   ```yaml
     name: Pull Request
     on: