diff --git a/README.md b/README.md
index 66a041a..dba103a 100644
--- a/README.md
+++ b/README.md
@@ -23,9 +23,7 @@ npm install --save-dev babel-plugin-transform-react-jsx
 
 ### Via `.babelrc` (Recommended)
 
-**.babelrc**
-
-Without options (no different from `transform-react-jsx`):
+#### Without options (no different from `transform-react-jsx`):
 
 ```json
 {
@@ -33,15 +31,15 @@ Without options (no different from `transform-react-jsx`):
 }
 ```
 
-With options:
+#### With options:
 
 ```json
 {
   "plugins": [
     ["transform-jsx-flexible", {
       "tags": {
-        "CustomTag1": "createElement_CustomTag1",
-        "CustomTag2": "createElement_CustomTag2"
+        "somelib.CustomTag1": "createElement_CustomTag1",
+        "somelib.CustomTag2": "createElement_CustomTag2"
       }
     }]
   ]
@@ -56,9 +54,9 @@ var profile = <div>
   <h3>{[user.firstName, user.lastName].join(' ')}</h3>
 </div>;
 
-var somethingElse = <CustomTag1>
+var somethingElse = <somelib.CustomTag1>
   <div />
-</CustomTag1>;
+</somelib.CustomTag1>;
 ```
 
 **Code Out**
@@ -69,7 +67,7 @@ var profile = React.createElement("div", null,
   React.createElement("h3", null, [user.firstName, user.lastName].join(" "))
 );
 
-var somethingElse = createElement_CustomTag1(CustomTag1, null,
+var somethingElse = createElement_CustomTag1(somelib.CustomTag1, null,
   createElement_CustomTag1("div", null)
 );
 ```
@@ -107,18 +105,22 @@ For example:
   "transform-jsx-flexible",
   {
     "tags": {
-      "CustomTag1": "createElement_CustomTag1",
-      "CustomTag2": "createElement_CustomTag2"
+      "somelib.CustomTag1": "createElement_CustomTag1",
+      "somelib.CustomTag2": "createElement_CustomTag2"
     }
   }
 ]
 ```
 
-Using this configuration, any `CustomTag1` element and any JSX elements
+Using this configuration, any `somelib.CustomTag1` element and any JSX elements
 enclosed inside of it will be created using the function
 `createElement_CustomTag1()` in the transpiled JS code, instead of
 `React.createElement` (or the current default JSX function).
 
-The same goes for `CustomTag2` and `createElement_CustomTag2`.  Also, JSX
-handlers can be changed within the same block by nesting these custom tags
+The same goes for `somelib.CustomTag2` and `createElement_CustomTag2`.  Also,
+JSX handlers can be changed within the same block by nesting these custom tags
 together.
+
+For clarity and explicitness, it's recommended, but not required, to specify
+any custom tags with a member expression (`somelib.CustomTag1` in the examples
+above), rather than simply a tag name.
diff --git a/index.js b/index.js
index df484f7..4c36f82 100644
--- a/index.js
+++ b/index.js
@@ -8,6 +8,18 @@ module.exports = function( { types: t } ) {
 			.reduce( ( object, property ) => t.memberExpression( object, property ) );
 	}
 
+	function getJSXMemberExpressionName( expr ) {
+		let namePieces = [];
+		if ( expr.object.object && expr.object.property ) {
+			namePieces = namePieces.concat(
+				getJSXMemberExpressionName( expr.object )
+			);
+		} else {
+			namePieces = namePieces.concat( expr.object.name );
+		}
+		return namePieces.concat( expr.property.name );
+	}
+
 	const JSX_ANNOTATION_REGEX = /\*?\s*@jsx\s+([^\s]+)/;
 
 	const visitor = helper( {
@@ -42,10 +54,20 @@ module.exports = function( { types: t } ) {
 			do {
 				const openingElement = currentPath.get( 'openingElement' );
 				if ( openingElement && openingElement.node ) {
-					const nodeName = openingElement.node.name.name;
-					if ( tagOptions[ nodeName ] ) {
+					const nodeNameExpr = openingElement.node.name;
+					let elementName;
+					if ( nodeNameExpr.type === 'JSXIdentifier' ) {
+						// A simple JSX expression like <TagName>
+						elementName = nodeNameExpr.name;
+					} else if ( nodeNameExpr.type === 'JSXMemberExpression' ) {
+						// A JSX member expression like <obj.TagName>
+						elementName = getJSXMemberExpressionName( nodeNameExpr )
+							.join( '.' );
+					}
+
+					if ( tagOptions[ elementName ] ) {
 						jsxCurrentIdentifier = stringToCallExpression(
-							tagOptions[ nodeName ]
+							tagOptions[ elementName ]
 						);
 						break;
 					}
diff --git a/test/fixtures/member-expression/member-expression/actual.js b/test/fixtures/member-expression/member-expression/actual.js
new file mode 100644
index 0000000..f27d96e
--- /dev/null
+++ b/test/fixtures/member-expression/member-expression/actual.js
@@ -0,0 +1,21 @@
+<CustomTag1 />;
+
+<CustomTag2 />;
+
+<namespaced.CustomTag2 />;
+
+<namespaced.rather.deeply.CustomTag3 />;
+
+<namespaced
+	.rather
+	.deeply
+	.CustomTag3
+>
+	<WithSomeWhitespace because="why not" />
+</namespaced
+	.rather
+	.deeply
+	.CustomTag3
+>;
+
+<Component prop="foo" />;
diff --git a/test/fixtures/member-expression/member-expression/expected.js b/test/fixtures/member-expression/member-expression/expected.js
new file mode 100644
index 0000000..fc04c7c
--- /dev/null
+++ b/test/fixtures/member-expression/member-expression/expected.js
@@ -0,0 +1,15 @@
+createElement_CustomTag1(CustomTag1, null);
+
+React.createElement(CustomTag2, null);
+
+createElement_CustomTag2(namespaced.CustomTag2, null);
+
+somelib.createElement_CustomTag3(namespaced.rather.deeply.CustomTag3, null);
+
+somelib.createElement_CustomTag3(
+	namespaced.rather.deeply.CustomTag3,
+	null,
+	somelib.createElement_CustomTag3(WithSomeWhitespace, { because: "why not" })
+);
+
+React.createElement(Component, { prop: "foo" });
diff --git a/test/fixtures/member-expression/options.json b/test/fixtures/member-expression/options.json
new file mode 100644
index 0000000..a3ca7f0
--- /dev/null
+++ b/test/fixtures/member-expression/options.json
@@ -0,0 +1,14 @@
+{
+	"plugins": [
+		[
+			"transform-jsx-flexible", {
+				"tags": {
+					"CustomTag1": "createElement_CustomTag1",
+					"namespaced.CustomTag2": "createElement_CustomTag2",
+					"namespaced.rather.deeply.CustomTag3": "somelib.createElement_CustomTag3"
+				}
+			}
+		]
+	]
+}
+