diff --git a/readme.md b/readme.md
index f56d6987..d70a3cf8 100644
--- a/readme.md
+++ b/readme.md
@@ -63,10 +63,12 @@ Outputs the Node.js compact build of `input.js` into `dist/index.js`.
   -e, --external [mod]     Skip bundling 'mod'. Can be used many times
   -q, --quiet              Disable build summaries / non-error outputs
   -w, --watch              Start a watched build
+  -t, --transpile-only     Use transpileOnly option with the ts-loader
   --v8-cache               Emit a build using the v8 compile cache
   --license [file]         Adds a file containing licensing information to the output
   --stats-out [file]       Emit webpack stats as json to the specified output file
-  --target [es2015|es2020] Select ecmascript target to use for output
+  --target [es]            ECMAScript target to use for output (default: es2015)
+                           Learn more: https://webpack.js.org/configuration/target
 ```
 
 ### Execution Testing
diff --git a/src/cli.js b/src/cli.js
index 30d940fd..6e4a8e53 100755
--- a/src/cli.js
+++ b/src/cli.js
@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 
-const { resolve, relative, dirname, sep, extname } = require("path");
+const { resolve, relative, dirname, sep } = require("path");
 const glob = require("glob");
 const shebangRegEx = require("./utils/shebang");
 const rimraf = require("rimraf");
@@ -35,7 +35,8 @@ Options:
   --v8-cache               Emit a build using the v8 compile cache
   --license [file]         Adds a file containing licensing information to the output
   --stats-out [file]       Emit webpack stats as json to the specified output file
-  --target                  What build target to use for webpack (default: es6)
+  --target [es]            ECMAScript target to use for output (default: es2015)
+                           Learn more: https://webpack.js.org/configuration/target
 `;
 
 // support an API mode for CLI testing
diff --git a/src/index.js b/src/index.js
index c79e9308..34639417 100644
--- a/src/index.js
+++ b/src/index.js
@@ -78,7 +78,7 @@ function ncc (
   }
 
   if (target && !target.startsWith('es')) {
-    throw new Error(`Invalid "target" value provided ${target}, value must be es version e.g. es5`)
+    throw new Error(`Invalid "target" value provided ${target}, value must be es version e.g. es2015`)
   }
 
   const resolvedEntry = resolve.sync(entry);