diff --git a/README.md b/README.md
index e8b8de6..09e9b71 100644
--- a/README.md
+++ b/README.md
@@ -99,6 +99,7 @@ Retrieves the video data at the specified time point (default keyframe), and the
 
 Parameters:
 - `time`: Required, in seconds.
+- `seekFlag`: The seek flag, defaults to 1 (seek backward). See `AVSeekFlag` for more details.
 
 ```typescript
 seekEncodedAudioChunk(time: number, seekFlag?: AVSeekFlag): Promise<EncodedAudioChunk>
@@ -107,6 +108,7 @@ Retrieves the audio data at the specified time point, and the return value can b
 
 Parameters:
 - `time`: Required, in seconds.
+- `seekFlag`: The seek flag, defaults to 1 (seek backward). See `AVSeekFlag` for more details.
 
 ```typescript
 readAVPacket(start?: number, end?: number, streamType?: AVMediaType, streamIndex?: number, seekFlag?: AVSeekFlag): ReadableStream<WebAVPacket>
diff --git a/README_CN.md b/README_CN.md
index da479a1..fbba8c8 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -100,6 +100,7 @@ seekEncodedVideoChunk(time: number, seekFlag?: AVSeekFlag): Promise<EncodedVideo
 
 参数:
 - `time`: 必填，单位为s
+- `seekFlag`: 寻址标志, 默认值为1 (向后寻址). 详情请查看 `AVSeekFlag`。
 
 ```typescript
 seekEncodedAudioChunk(time: number, seekFlag?: AVSeekFlag): Promise<EncodedAudioChunk>
@@ -108,6 +109,7 @@ seekEncodedAudioChunk(time: number, seekFlag?: AVSeekFlag): Promise<EncodedAudio
 
 参数:
 - `time`: 必填，单位为s
+- `seekFlag`: 寻址标志, 默认值为1 (向后寻址). 详情请查看 `AVSeekFlag`。
 
 ```typescript
 readAVPacket(start?: number, end?: number, streamType?: AVMediaType, streamIndex?: number, seekFlag?: AVSeekFlag): ReadableStream<WebAVPacket>