diff --git a/index.js b/index.js
index 39ffab4..b9869cc 100644
--- a/index.js
+++ b/index.js
@@ -50,8 +50,9 @@ function existsSync(path) {
 }
 
 class Funnel extends Plugin {
-  constructor(inputNode, options = {}) {
-    super([inputNode], {
+  constructor(inputs, options = {}) {
+    let inputNodes = Array.isArray(inputs) ? inputs : [inputs];
+    super(inputNodes, {
       annotation: options.annotation,
       persistentOutput: true,
       needsCache: false,
diff --git a/tests/index.js b/tests/index.js
index 40671c5..a4367ed 100644
--- a/tests/index.js
+++ b/tests/index.js
@@ -1106,4 +1106,66 @@ describe('broccoli-funnel', function() {
       expect(getDestPathCalled).to.be.equal(1);
     });
   });
+
+  describe('subclassing', function() {
+    it('can be subclassed, simple destDir modification', async function() {
+      class FunnelSubclass extends Funnel.Funnel {
+        constructor(input, options) {
+          super(input, options);
+
+          this._hasBuilt = false;
+        }
+
+        build() {
+          if (this._hasBuilt === false) {
+            this.destDir = 'lol';
+            this._hasBuilt = true;
+          }
+
+          return super.build();
+        }
+      }
+
+      let inputPath = input.path('lib/utils');
+      let node = new FunnelSubclass(inputPath, {});
+      output = createBuilder(node);
+
+      await output.build();
+      let outputPath = output.path();
+
+      expect(walkSync(outputPath)).to.eql(['lol/', 'lol/foo.js']);
+    });
+
+    it('subclasses can provide additional trees', async function() {
+      class FunnelSubclass extends Funnel.Funnel {
+        constructor(inputNode, options) {
+          super([inputNode, input.path('dir1/subdir2')], options);
+
+          this._hasBuilt = false;
+        }
+
+        build() {
+          if (this._hasBuilt === false) {
+            if (!fs.existsSync(`${this.inputPaths[1]}/bar.css`)) {
+              throw new Error('Could not find file!!!');
+            }
+            // set custom destDir to ensure our custom build code ran
+            this.destDir = 'lol';
+            this._hasBuilt = true;
+          }
+
+          return super.build();
+        }
+      }
+
+      let inputPath = input.path('lib/utils');
+      let node = new FunnelSubclass(inputPath, {});
+      output = createBuilder(node);
+
+      await output.build();
+      let outputPath = output.path();
+
+      expect(walkSync(outputPath)).to.eql(['lol/', 'lol/foo.js']);
+    });
+  });
 });