diff --git a/index.js b/index.js
index b6fdae6..3c9b239 100644
--- a/index.js
+++ b/index.js
@@ -40,7 +40,7 @@ function idFromFilename(filename, ext) {
 }
 
 // Compile a Couchapp module.
-function compileModule(filename, options, callback) {
+function compileModule(extension, filename, options, callback) {
   var doc;
   var err;
 
@@ -55,7 +55,7 @@ function compileModule(filename, options, callback) {
   }
 
   if (!doc._id) {
-    doc._id = idFromFilename(filename, '.js');
+    doc._id = idFromFilename(filename, extension);
   }
 
   callback(null, doc);
@@ -185,14 +185,30 @@ function compileDirectory(dir, options, callback) {
 
 function useIndex(source, options, callback) {
   if (!options.index) {
-    return callback(null, false);
+    return callback(null, null);
   }
 
   var filename = path.join(source, 'index.js');
 
   fs.stat(filename, function(err, stats) {
     if (err && err.code === 'ENOENT') {
-      return callback(null, false);
+      filename = path.join(source, 'index.coffee');
+
+      fs.stat(filename, function(err, stats) {
+        if (err && err.code === 'ENOENT') {
+          return callback(null, null);
+        }
+
+        if (err) {
+          return callback(err);
+        }
+
+        if (stats.isFile()) {
+          return callback(null, '.coffee');
+        }
+      })
+
+      return;
     }
 
     if (err) {
@@ -200,7 +216,7 @@ function useIndex(source, options, callback) {
     }
 
     if (stats.isFile()) {
-      return callback(null, true);
+      return callback(null, '.js');
     }
   })
 }
@@ -226,13 +242,13 @@ module.exports = function compile(source, options, callback) {
     }
 
     if (stats.isDirectory()) {
-      return useIndex(source, options, function(err, answer) {
+      return useIndex(source, options, function(err, ext) {
         if (err) {
           return callback(err);
         }
 
-        if (answer) {
-          return compileModule(source, options, callback);
+        if (null !== ext) {
+          return compileModule(ext, source, options, callback);
         }
 
         compileDirectory(source, options, callback);
@@ -245,9 +261,10 @@ module.exports = function compile(source, options, callback) {
 
     var ext = path.extname(source);
 
-    switch (path.extname(source)) {
+    switch (ext) {
       case '.js':
-        compileModule(source, options, callback);
+      case '.coffee':
+        compileModule(ext, source, options, callback);
         break;
 
       case '.json':
diff --git a/package.json b/package.json
index 00492ca..90eaab9 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,6 @@
 {
   "name": "couchdb-compile",
+  "version": "0.0.0-semantically-released",
   "description": "Build CouchDB documents from fs.",
   "main": "index.js",
   "bin": "cli.js",
@@ -28,8 +29,9 @@
     "minimist": "^1.2.0"
   },
   "devDependencies": {
+    "coffee-script": "^1.10.0",
+    "semantic-release": "^6.0.3",
     "tap-spec": "^4.1.0",
-    "tape": "^4.2.1",
-    "semantic-release": "^6.0.3"
+    "tape": "^4.2.1"
   }
 }
diff --git a/test/compile-test.js b/test/compile-test.js
index 67cba5c..44c0445 100644
--- a/test/compile-test.js
+++ b/test/compile-test.js
@@ -1,3 +1,5 @@
+require('coffee-script/register');
+
 var test = require('tape');
 var compile = require('..');
 var fs = require('fs');
diff --git a/test/expected/coffee-module.json b/test/expected/coffee-module.json
new file mode 100644
index 0000000..9324ce5
--- /dev/null
+++ b/test/expected/coffee-module.json
@@ -0,0 +1,4 @@
+{
+  "_id": "coffee-module",
+  "foo": "bar"
+}
diff --git a/test/expected/coffee.json b/test/expected/coffee.json
new file mode 100644
index 0000000..1bbe18d
--- /dev/null
+++ b/test/expected/coffee.json
@@ -0,0 +1,10 @@
+{
+  "_id": "_design/full",
+  "language": "coffeescript",
+  "views": {
+    "numbers": {
+      "map": "(doc) -> emit doc.number, null if doc.number",
+      "reduce": "_count"
+    }
+  }
+}
diff --git a/test/fixtures/coffee-module/index.coffee b/test/fixtures/coffee-module/index.coffee
new file mode 100644
index 0000000..8c260b7
--- /dev/null
+++ b/test/fixtures/coffee-module/index.coffee
@@ -0,0 +1 @@
+module.exports = foo: 'bar'
diff --git a/test/fixtures/coffee/_id b/test/fixtures/coffee/_id
new file mode 100644
index 0000000..9249e89
--- /dev/null
+++ b/test/fixtures/coffee/_id
@@ -0,0 +1 @@
+_design/full
diff --git a/test/fixtures/coffee/language b/test/fixtures/coffee/language
new file mode 100644
index 0000000..df56ceb
--- /dev/null
+++ b/test/fixtures/coffee/language
@@ -0,0 +1 @@
+coffeescript
diff --git a/test/fixtures/coffee/views/numbers/map.coffee b/test/fixtures/coffee/views/numbers/map.coffee
new file mode 100644
index 0000000..87e56cd
--- /dev/null
+++ b/test/fixtures/coffee/views/numbers/map.coffee
@@ -0,0 +1 @@
+(doc) -> emit doc.number, null if doc.number
diff --git a/test/fixtures/coffee/views/numbers/reduce b/test/fixtures/coffee/views/numbers/reduce
new file mode 100644
index 0000000..c866cd7
--- /dev/null
+++ b/test/fixtures/coffee/views/numbers/reduce
@@ -0,0 +1 @@
+_count