diff --git a/packages/docz-core/package.json b/packages/docz-core/package.json
index 3eaa12de5..a8ae64056 100644
--- a/packages/docz-core/package.json
+++ b/packages/docz-core/package.json
@@ -64,6 +64,7 @@
     "lodash.get": "^4.4.2",
     "mini-html-webpack-plugin": "^0.2.3",
     "react-dev-utils": "^6.1.0",
+    "p-reduce": "^1.0.0",
     "react-docgen-typescript-loader": "^3.0.0-rc.0",
     "react-hot-loader": "4.3.11",
     "rehype-docz": "^0.12.9",
@@ -96,6 +97,7 @@
     "@types/koa": "^2.0.46",
     "@types/lodash.get": "^4.4.4",
     "@types/node": "10.12.1",
+    "@types/p-reduce": "^1.0.0",
     "@types/prettier": "^1.13.2",
     "@types/resolve": "^0.0.8",
     "@types/webpack": "^4.4.17",
diff --git a/packages/docz-core/src/Entries.ts b/packages/docz-core/src/Entries.ts
index 75f629752..ebfbe60e3 100644
--- a/packages/docz-core/src/Entries.ts
+++ b/packages/docz-core/src/Entries.ts
@@ -80,7 +80,7 @@ export class Entries {
   }
 
   private async getMap(config: Config): Promise<EntryMap> {
-    const { src, files: pattern, ignore } = config
+    const { src, files: pattern, ignore, plugins } = config
     const arr = Array.isArray(pattern) ? pattern : [pattern]
     const toMatch = matchFilesWithSrc(config)
 
@@ -109,8 +109,13 @@ export class Entries {
       }
     }
 
+    const reduce = Plugin.reduceFromPlugins<string[]>(plugins)
+    const modifiedFiles = reduce('modifyFiles', files)
+
     const map = new Map()
-    const entries = await Promise.all(files.map(createEntry).filter(Boolean))
+    const entries = await Promise.all(
+      modifiedFiles.map(createEntry).filter(Boolean)
+    )
 
     for (const entry of entries) {
       if (entry) {
diff --git a/packages/docz-core/src/Plugin.ts b/packages/docz-core/src/Plugin.ts
index 4df7b2fbb..7cb062e88 100644
--- a/packages/docz-core/src/Plugin.ts
+++ b/packages/docz-core/src/Plugin.ts
@@ -1,16 +1,18 @@
 import get from 'lodash.get'
+import pReduce from 'p-reduce'
 
 import { Config } from './commands/args'
 import { isFn } from './utils/helpers'
 import { BabelRC } from './utils/babel-config'
 
-export type SetConfig = (config: Config) => Config
+export type SetConfig = (config: Config) => Config | Promise<Config>
 export type ModifyBundlerConfig<C = any> = (
   config: C,
   dev: boolean,
   args: Config
 ) => C
 export type ModifyBabelRC = (babelrc: BabelRC, args: Config) => BabelRC
+export type ModifyFiles = (files: string[], args: Config) => string[]
 export type onCreateApp = <A>(app: A) => void
 export type OnServerListening = <S>(server: S) => void
 export type OnPreBuild = (args: Config) => void
@@ -22,6 +24,7 @@ export interface PluginFactory {
   setConfig?: SetConfig
   modifyBundlerConfig?: ModifyBundlerConfig
   modifyBabelRc?: ModifyBabelRC
+  modifyFiles?: ModifyFiles
   onCreateApp?: onCreateApp
   onServerListening?: OnServerListening
   onPreBuild?: OnPreBuild
@@ -64,9 +67,25 @@ export class Plugin<C = any> implements PluginFactory {
     }
   }
 
+  public static reduceFromPluginsAsync<C>(
+    plugins: Plugin[] | undefined
+  ): (method: keyof Plugin, initial: C, ...args: any[]) => Promise<C> {
+    return (method, initial, ...args) => {
+      return pReduce(
+        [...(plugins || [])],
+        (obj: any, plugin: any) => {
+          const fn = get(plugin, method)
+          return Promise.resolve(fn && isFn(fn) ? fn(obj, ...args) : obj)
+        },
+        initial
+      )
+    }
+  }
+
   public readonly setConfig?: SetConfig
   public readonly modifyBundlerConfig?: ModifyBundlerConfig<C>
   public readonly modifyBabelRc?: ModifyBabelRC
+  public readonly modifyFiles?: ModifyFiles
   public readonly onCreateApp?: onCreateApp
   public readonly onServerListening?: OnServerListening
   public readonly onPreBuild?: OnPreBuild
@@ -78,6 +97,7 @@ export class Plugin<C = any> implements PluginFactory {
     this.setConfig = p.setConfig
     this.modifyBundlerConfig = p.modifyBundlerConfig
     this.modifyBabelRc = p.modifyBabelRc
+    this.modifyFiles = p.modifyFiles
     this.onCreateApp = p.onCreateApp
     this.onServerListening = p.onServerListening
     this.onPreBuild = p.onPreBuild
diff --git a/packages/docz-core/src/commands/build.ts b/packages/docz-core/src/commands/build.ts
index 1990248aa..d7070b4ec 100644
--- a/packages/docz-core/src/commands/build.ts
+++ b/packages/docz-core/src/commands/build.ts
@@ -11,7 +11,7 @@ import { Config } from './args'
 
 export const build = async (args: Config) => {
   const env = envDotProp.get('node.env')
-  const config = loadConfig(args)
+  const config = await loadConfig(args)
   const entries = new Entries(config)
 
   const bundler = webpack(config, env)
diff --git a/packages/docz-core/src/commands/dev.ts b/packages/docz-core/src/commands/dev.ts
index 21b50ff0e..6400ef7f2 100644
--- a/packages/docz-core/src/commands/dev.ts
+++ b/packages/docz-core/src/commands/dev.ts
@@ -11,7 +11,7 @@ import { loadConfig } from '../utils/load-config'
 
 export const dev = async (args: Config) => {
   const env = envDotProp.get('node.env')
-  const config = loadConfig(args)
+  const config = await loadConfig(args)
   const port = await detectPort(config.port)
   const hotPort = await detectPort(config.hotPort)
   const websocketPort = await detectPort(config.websocketPort)
diff --git a/packages/docz-core/src/types.d.ts b/packages/docz-core/src/types.d.ts
index efc884e92..665a24473 100644
--- a/packages/docz-core/src/types.d.ts
+++ b/packages/docz-core/src/types.d.ts
@@ -37,3 +37,4 @@ declare module 'detect-port'
 declare module 'react-dev-utils/FileSizeReporter'
 declare module 'react-dev-utils/formatWebpackMessages'
 declare module 'react-dev-utils/printBuildError'
+declare module 'p-reduce'
diff --git a/packages/docz-core/src/utils/load-config.ts b/packages/docz-core/src/utils/load-config.ts
index 0ca260f35..618fdae6d 100644
--- a/packages/docz-core/src/utils/load-config.ts
+++ b/packages/docz-core/src/utils/load-config.ts
@@ -14,7 +14,7 @@ const defaultHtmlContext = {
   lang: 'en',
 }
 
-export const loadConfig = (args: Config): Config => {
+export const loadConfig = async (args: Config): Promise<Config> => {
   const defaultConfig = {
     ...args,
     hashRouter: false,
@@ -33,6 +33,9 @@ export const loadConfig = (args: Config): Config => {
     ? loadFrom<Config>(path.resolve(args.config), defaultConfig)
     : load<Config>('docz', defaultConfig)
 
-  const reduce = Plugin.reduceFromPlugins<Config>(config.plugins)
-  return omit<Config>(toOmit, reduce('setConfig', { ...config, paths }))
+  const reduceAsync = Plugin.reduceFromPluginsAsync<Config>(config.plugins)
+  return omit<Config>(
+    toOmit,
+    await reduceAsync('setConfig', { ...config, paths })
+  )
 }