diff --git a/readme.md b/readme.md
index fed18534..f3485a8d 100644
--- a/readme.md
+++ b/readme.md
@@ -73,6 +73,7 @@ Outputs the Node.js compact build of `input.js` into `dist/index.js`.
   --stats-out [file]       Emit webpack stats as json to the specified output file
   --target [es]            ECMAScript target to use for output (default: es2015)
                            Learn more: https://webpack.js.org/configuration/target
+  -d, --debug              Show debug logs
 ```
 
 ### Execution Testing
diff --git a/src/cli.js b/src/cli.js
index 291860aa..0cc5f4fd 100755
--- a/src/cli.js
+++ b/src/cli.js
@@ -38,6 +38,7 @@ Options:
   --stats-out [file]       Emit webpack stats as json to the specified output file
   --target [es]            ECMAScript target to use for output (default: es2015)
                            Learn more: https://webpack.js.org/configuration/target
+  -d, --debug              Show debug logs
 `;
 
 // support an API mode for CLI testing