diff --git a/docs/src/content/docs/apis/launch.md b/docs/src/content/docs/apis/launch.md
index fb3bf3c..7f1f76b 100644
--- a/docs/src/content/docs/apis/launch.md
+++ b/docs/src/content/docs/apis/launch.md
@@ -67,7 +67,7 @@ const nostalgist = await Nostalgist.launch({
 
     **type:** `string | HTMLCanvasElement` **default:** an empty string `''`
 
-    Use this option to specify the canvas element you want to launch the emulator with. If it's an `string`, we will look up the element by `document.querySelector`
+    Use this option to specify the canvas element you want to launch the emulator with. If it's an `string`, we will look up the element by `document.querySelector`.
 
     If it's an empty string, a canvas element will be created automatically and this canvas element will be append to `document.body`.
 
@@ -260,8 +260,15 @@ const nostalgist = await Nostalgist.launch({
 
     For example,
     ```js
-    const nostalgist = await Nostalgist.launch(options) // will not launch the emulator
-    await nostalgist.launchEmulator() // the emulator will be started
+    // will not launch the emulator
+    const nostalgist = await Nostalgist.launch({
+      core: 'fceumm',
+      rom: 'flappybird.nes',
+      runEmulatorManually: true
+    })
+
+    // the emulator will be launched
+    await nostalgist.launchEmulator()
     ```
 
   + #### `emscriptenModule`
diff --git a/docs/src/content/docs/guides/related.md b/docs/src/content/docs/guides/related.md
index d023d3c..179ea49 100644
--- a/docs/src/content/docs/guides/related.md
+++ b/docs/src/content/docs/guides/related.md
@@ -7,7 +7,6 @@ title: Related
 + These are the fundamental dependencies of Nostalgist.js.
   + [RetroArch](https://www.retroarch.com/) and its friends(the emulators/cores)
   + [Emscripten](https://emscripten.org/)
-  + [BrowserFS](https://github.com/jvilk/BrowserFS)
 
 + We are using ROMs here for the purpose of demonstration.
   + [retrobrews](https://retrobrews.github.io/) and the authors of the homebrew games.
diff --git a/docs/src/content/docs/guides/under-the-hood.md b/docs/src/content/docs/guides/under-the-hood.md
index be55370..176765d 100644
--- a/docs/src/content/docs/guides/under-the-hood.md
+++ b/docs/src/content/docs/guides/under-the-hood.md
@@ -25,9 +25,7 @@ await Nostalgist.nes('https://your-server.com/roms/super-mario-bros.nes')
 Make sure your server have configured the CORS headers properly.
 
 ### Step two
-Prepare a virtual file system.
-
-We use [BrowserFS](https://github.com/jvilk/BrowserFS)'s `MemoryFS` to create a virtual file system. The files loaded by step one will be written here as well.
+Prepare a virtual file system. The files loaded by step one will be written here as well.
 
 ### Step three
 Launch RetroArch with the virtual file system and the canvas element we specified in the code.
diff --git a/readme.md b/readme.md
index ddce4e0..581dd84 100644
--- a/readme.md
+++ b/readme.md
@@ -98,7 +98,6 @@ Please refer to [nostalgist.js.org/apis](https://nostalgist.js.org/apis).
 + These are the fundamental dependencies of Nostalgist.js.
   + [RetroArch](https://www.retroarch.com/) and its friends(the emulators/cores)
   + [Emscripten](https://emscripten.org/)
-  + [BrowserFS](https://github.com/jvilk/BrowserFS)
 
 + We are using ROMs here for the purpose of demonstration.
   + [retrobrews](https://retrobrews.github.io/) and the authors of the homebrew games.