diff --git a/README.md b/README.md
index bfcb9a7..919abba 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,14 @@ Find undeclared identifiers and properties that are used in the `source` string.
 
 Set `opts.properties` to false to only return identifiers.
 
+When `opts.wildcard` is true, unknown uses of undeclared identifiers will be added to `res.properties` as `'VarName.*'`.
+
+```js
+undeclaredIdentifiers('Buffer(), Buffer.from()', { wildcard: true })
+// { identifiers: ['Buffer'],
+//   properties: ['Buffer.*', 'Buffer.from'] }
+```
+
 ## License
 
 [Apache-2.0](LICENSE.md)
diff --git a/index.js b/index.js
index a869a44..dc34a70 100644
--- a/index.js
+++ b/index.js
@@ -51,6 +51,11 @@ var bindingVisitor = {
     }
 
     state.undeclared[node.name] = true
+    if (state.wildcard &&
+        !(parent.type === 'VariableDeclarator' && parent.id === node) &&
+        !(parent.type === 'AssignmentExpression' && parent.left === node)) {
+      state.undeclaredProps[node.name + '.*'] = true
+    }
   },
   MemberExpression: function (node, state, ancestors) {
     if (!state.properties) return
@@ -68,14 +73,16 @@ var bindingVisitor = {
 module.exports = function findUndeclared (src, opts) {
   opts = xtend({
     identifiers: true,
-    properties: true
+    properties: true,
+    wildcard: false
   }, opts)
 
   var state = {
     undeclared: {},
     undeclaredProps: {},
     identifiers: opts.identifiers,
-    properties: opts.properties
+    properties: opts.properties,
+    wildcard: opts.wildcard
   }
   var ast = acorn.parse(src)
 
diff --git a/test/index.js b/test/index.js
index 4a6b245..4c7279a 100644
--- a/test/index.js
+++ b/test/index.js
@@ -23,6 +23,19 @@ test('undeclared properties', function (t) {
   t.end()
 })
 
+test('wildcard use of undeclared name', function (t) {
+  t.deepEqual(find(`
+    function func () {}
+    new A()
+    A.from()
+    func(b)
+  `, { wildcard: true }), {
+    identifiers: ['A', 'b'],
+    properties: ['A.*', 'A.from', 'b.*']
+  })
+  t.end()
+})
+
 test('function names', function (t) {
   t.deepEqual(find(`
     function x () {