diff --git a/docs/guide.md b/docs/guide.md
index 5e53ee5..846f65f 100644
--- a/docs/guide.md
+++ b/docs/guide.md
@@ -106,7 +106,7 @@ You can custom your player instance by those options
 | hotkey               | true                               | enable hotkey, support FF, FR, volume control, play & pause                                                                                                |
 | preload              | 'auto'                             | values: 'none', 'metadata', 'auto'                                                                                                                         |
 | volume               | 0.7                                | default volume, notice that player will remember user setting, default volume will not work after user set volume themselves                               |
-| playbackSpeed        | [0.5, 0.75, 1, 1.25, 1.5, 2]       | default playback speed, or or you can set a custom one                                                                                                     |
+| playbackSpeed        | [0.5, 0.75, 1, 1.25, 1.5, 2]       | optional playback speed, or or you can set a custom one                                                                                                    |
 | logo                 | -                                  | showing logo in the top left corner, you can adjust its size and position by CSS                                                                           |
 | apiBackend           | -                                  | getting and sending danmaku in your way, see [#live](#live)                                                                                                |
 | video                | -                                  | video info                                                                                                                                                 |
diff --git a/docs/zh/guide.md b/docs/zh/guide.md
index 9a4ee0e..0ddf8a9 100644
--- a/docs/zh/guide.md
+++ b/docs/zh/guide.md
@@ -96,7 +96,7 @@ DPlayer 有丰富的参数可以自定义你的播放器实例
 | hotkey               | true                               | 开启热键，支持快进、快退、音量控制、播放暂停                                                            |
 | preload              | 'auto'                             | 视频预加载，可选值: 'none', 'metadata', 'auto'                                                          |
 | volume               | 0.7                                | 默认音量，请注意播放器会记忆用户设置，用户手动设置音量后默认音量即失效                                  |
-| playbackSpeed        | [0.5, 0.75, 1, 1.25, 1.5, 2]       | 默认播放速率，可以设置成自定义的数组                                                                    |
+| playbackSpeed        | [0.5, 0.75, 1, 1.25, 1.5, 2]       | 可选的播放速率，可以设置成自定义的数组                                                                  |
 | logo                 | -                                  | 在左上角展示一个 logo，你可以通过 CSS 调整它的大小和位置                                                |
 | apiBackend           | -                                  | 自定义获取和发送弹幕行为，见[#直播](#直播)                                                              |
 | video                | -                                  | 视频信息                                                                                                |