diff --git a/README.md b/README.md
index 93f4466..a111bbd 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,7 @@ Just like `microbundle build`, but watches your source files and rebuilds on any
     -w, --watch      Rebuilds on any change  (default false)
     --target         Specify your target environment  (default node)
     --external       Specify external dependencies, or 'none'
+    --globals        Specify globals dependencies, or 'none'
     --compress       Compress output using UglifyJS  (default true)
     --strict         Enforce undefined global context and add "use strict"
     --name           Specify name exposed in UMD builds
diff --git a/src/index.js b/src/index.js
index 9c5fbee..71ec88b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -31,6 +31,14 @@ const safeVariableName = name =>
 			.toLowerCase()
 			.replace(/((^[^a-zA-Z]+)|[^\w.-])|([^a-zA-Z0-9]+$)/g, ''),
 	);
+const parseGlobals = globalStrings => {
+	const globals = {};
+	globalStrings.split(',').forEach(globalString => {
+		const [localName, globalName] = globalString.split('=');
+		globals[localName] = globalName;
+	});
+	return globals;
+};
 
 const WATCH_OPTS = {
 	exclude: 'node_modules/**',
@@ -243,6 +251,9 @@ function createConfig(options, entry, format, writeMeta) {
 		}
 		return globals;
 	}, {});
+	if (options.globals && options.globals !== 'none') {
+		globals = Object.assign(globals, parseGlobals(options.globals));
+	}
 
 	function replaceName(filename, name) {
 		return resolve(
diff --git a/src/prog.js b/src/prog.js
index f627f13..a251c90 100644
--- a/src/prog.js
+++ b/src/prog.js
@@ -20,6 +20,8 @@ export default handler => {
 		.option('--watch, -w', 'Rebuilds on any change', false)
 		.option('--target', 'Specify your target environment', 'node')
 		.option('--external', `Specify external dependencies, or 'none'`)
+		.option('--globals', `Specify globals dependencies, or 'none'`)
+		.example('microbundle --globals react=React,jquery=$')
 		.option('--compress', 'Compress output using UglifyJS', true)
 		.option('--strict', 'Enforce undefined global context and add "use strict"')
 		.option('--name', 'Specify name exposed in UMD builds')