diff --git a/README.md b/README.md
index 7aa7877..72b09cb 100644
--- a/README.md
+++ b/README.md
@@ -12,14 +12,14 @@ npm install postcss-partial-process
 
 ```js
 postcss([
-    require('postcss-partial-process')({
-        startComment: 'postcss-partial-process start', // default
-        endComment: 'postcss-partial-process end', // default
-        removeComments: 'auto', // default, means the comments are removed unless they are important (e.g. /*! like this */); also accepts `true` or `false`
-        plugins = [
-            require('some postcss plugin'), // this plugin will only run between the comments "postcss-partial-process start" and "postcss-partial-process end"
-        ],
-    }),
+  require('postcss-partial-process')({
+    startComment: 'postcss-partial-process start', // default
+    endComment: 'postcss-partial-process end', // default
+    removeComments: 'auto', // default, means the comments are removed unless they are important (e.g. /*! like this */); also accepts `true` or `false`
+    plugins = [
+      require('some postcss plugin'), // this plugin will only run between the comments "postcss-partial-process start" and "postcss-partial-process end"
+    ],
+  }),
 ])
 ```
 
diff --git a/index.js b/index.js
index be4d692..4edf431 100644
--- a/index.js
+++ b/index.js
@@ -1,69 +1,69 @@
 const postcss = require('postcss');
 
 module.exports = postcss.plugin('postcss-partial-process', ({
-    startComment = 'postcss-partial-process start',
-    endComment = 'postcss-partial-process end',
-    removeComments = 'auto',
-    plugins = []
+  startComment = 'postcss-partial-process start',
+  endComment = 'postcss-partial-process end',
+  removeComments = 'auto',
+  plugins = []
 } = {}) => {
-    return root => {
-        let processing = false;
-        let partialRoot = null;
-        const promises = [];
+  return root => {
+    let processing = false;
+    let partialRoot = null;
+    const promises = [];
 
-        const end = (callback) => {
-            promises.push(
-                postcss(plugins).process(partialRoot, {
-                    from: undefined
-                }).then(callback)
-            );
-        };
-
-        root.each(node => {
-            let starting = false;
-            let ending = false;
-            let removeComment = false;
-
-            if (node.type === 'comment') {
-                let comment = node.toString();
-                let matches = comment.match(/\/\*!?\s*(.*?)\s*\*\//, '');
-                matches = matches || [];
-                if (matches.length > 1) {
-                    starting = !processing && matches[1] === startComment;
-                    ending = processing && matches[1] === endComment;
-                    removeComment = removeComments === true || (removeComments === 'auto' && !comment.startsWith('/*!'));
-                }
-            }
-
-            if (ending) {
-                end(result => {
-                    node.before(result.root);
-                    if (removeComment) {
-                        node.remove();
-                    }
-                });
-                processing = false;
-            }
-
-            if (processing) {
-                partialRoot.append(node);
-            }
-
-            if (starting) {
-                partialRoot = postcss.root();
-                if (removeComment) {
-                    node.remove();
-                }
-                processing = true;
-            }
-        });
-
-        if (processing) {
-            end(result => {
-                root.append(result.root);
-            });
-        }
-
-        return Promise.all(promises);
+    const end = (callback) => {
+      promises.push(
+        postcss(plugins).process(partialRoot, {
+          from: undefined
+        }).then(callback)
+      );
     };
+
+    root.each(node => {
+      let starting = false;
+      let ending = false;
+      let removeComment = false;
+
+      if (node.type === 'comment') {
+        let comment = node.toString();
+        let matches = comment.match(/\/\*!?\s*(.*?)\s*\*\//, '');
+        matches = matches || [];
+        if (matches.length > 1) {
+          starting = !processing && matches[1] === startComment;
+          ending = processing && matches[1] === endComment;
+          removeComment = removeComments === true || (removeComments === 'auto' && !comment.startsWith('/*!'));
+        }
+      }
+
+      if (ending) {
+        end(result => {
+          node.before(result.root);
+          if (removeComment) {
+            node.remove();
+          }
+        });
+        processing = false;
+      }
+
+      if (processing) {
+        partialRoot.append(node);
+      }
+
+      if (starting) {
+        partialRoot = postcss.root();
+        if (removeComment) {
+          node.remove();
+        }
+        processing = true;
+      }
+    });
+
+    if (processing) {
+      end(result => {
+        root.append(result.root);
+      });
+    }
+
+    return Promise.all(promises);
+  };
 });
diff --git a/test.js b/test.js
index 52119fe..19a6fc3 100644
--- a/test.js
+++ b/test.js
@@ -3,120 +3,120 @@ const partialProcess = require('./');
 const prependSelector = require('postcss-prepend-selector');
 
 function run(input, output, opts) {
-    return postcss([
-            partialProcess(opts),
-        ])
-        .process(input, {
-            from: undefined,
-        })
-        .then(result => {
-            expect(result.css).toEqual(output);
-            expect(result.warnings().length).toBe(0);
-        });
+  return postcss([
+      partialProcess(opts),
+    ])
+    .process(input, {
+      from: undefined,
+    })
+    .then(result => {
+      expect(result.css).toEqual(output);
+      expect(result.warnings().length).toBe(0);
+    });
 }
 
 test('it compiles', () => {
-    return run('a {}', 'a {}', {});
+  return run('a {}', 'a {}', {});
 });
 
 test('rules inside the comments are processed', () => {
-    return run(`
-        /* postcss-partial-process start */
-        a {}
-        b {}
-        /* postcss-partial-process end */
-    `, `
-        #a a {}
-        #a b {}
-    `, {
-        plugins: [
-            prependSelector({ selector: '#a ' }),
-        ],
-    });
+  return run(`
+    /* postcss-partial-process start */
+    a {}
+    b {}
+    /* postcss-partial-process end */
+  `, `
+    #a a {}
+    #a b {}
+  `, {
+    plugins: [
+      prependSelector({ selector: '#a ' }),
+    ],
+  });
 });
 
 test('rules outside the comments are not processed', () => {
-    return run(`
-        body {}
-        /* postcss-partial-process start */
-        a {}
-        /* postcss-partial-process end */
-        b {}
-        a {}
-    `, `
-        body {}
-        #a a {}
-        b {}
-        a {}
-    `, {
-        plugins: [
-            prependSelector({ selector: '#a ' }),
-        ],
-    });
+  return run(`
+    body {}
+    /* postcss-partial-process start */
+    a {}
+    /* postcss-partial-process end */
+    b {}
+    a {}
+  `, `
+    body {}
+    #a a {}
+    b {}
+    a {}
+  `, {
+    plugins: [
+      prependSelector({ selector: '#a ' }),
+    ],
+  });
 });
 
 test('start/end comments can be customized', () => {
-    return run(`
-        /* yo start */
-        .test { hello: world; }
-        /* yo stop */
-        b {}
-    `, `
-        #a .test { hello: world; }
-        b {}
-    `, {
-        startComment: 'yo start',
-        endComment: 'yo stop',
-        plugins: [
-            prependSelector({ selector: '#a ' }),
-        ],
-    });
+  return run(`
+    /* yo start */
+    .test { hello: world; }
+    /* yo stop */
+    b {}
+  `, `
+    #a .test { hello: world; }
+    b {}
+  `, {
+    startComment: 'yo start',
+    endComment: 'yo stop',
+    plugins: [
+      prependSelector({ selector: '#a ' }),
+    ],
+  });
 });
 
 test('comments are not removed with removeComments: false', () => {
-    return run(`
-        /* postcss-partial-process start */
-        a {}
-        /* postcss-partial-process end */
-    `, `
-        /* postcss-partial-process start */
-        #a a {}
-        /* postcss-partial-process end */
-    `, {
-        removeComments: false,
-        plugins: [
-            prependSelector({ selector: '#a ' }),
-        ],
-    });
+  return run(`
+    /* postcss-partial-process start */
+    a {}
+    /* postcss-partial-process end */
+  `, `
+    /* postcss-partial-process start */
+    #a a {}
+    /* postcss-partial-process end */
+  `, {
+    removeComments: false,
+    plugins: [
+      prependSelector({ selector: '#a ' }),
+    ],
+  });
 });
 
 test('important comments are not removed by default', () => {
-    return run(`
-        /*! postcss-partial-process start */
-        a {}
-        /*! postcss-partial-process end */
-    `, `
-        /*! postcss-partial-process start */
-        #a a {}
-        /*! postcss-partial-process end */
-    `, {
-        plugins: [
-            prependSelector({ selector: '#a ' }),
-        ],
-    });
+  return run(`
+    /*! postcss-partial-process start */
+    a {}
+    /*! postcss-partial-process end */
+  `, `
+    /*! postcss-partial-process start */
+    #a a {}
+    /*! postcss-partial-process end */
+  `, {
+    plugins: [
+      prependSelector({ selector: '#a ' }),
+    ],
+  });
 });
 
 test('important comments are removed with removeComments: true', () => {
-    return run(`
-        /*! postcss-partial-process start */
-        a {}
-        /*! postcss-partial-process end */
-    `, `
-        #a a {}
-    `, {
-        removeComments: true,
-        plugins: [
-            prependSelector({ selector: '#a ' }),
-        ],
-    });
+  return run(`
+    /*! postcss-partial-process start */
+    a {}
+    /*! postcss-partial-process end */
+  `, `
+    #a a {}
+  `, {
+    removeComments: true,
+    plugins: [
+      prependSelector({ selector: '#a ' }),
+    ],
+  });
 });