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en/docs/dev_doc/protocols/xu316_zerocode_protocol.md

@@ -222,8 +222,8 @@ sequenceDiagram
     | 0x21 | Media Control | MCU→XU316 |
     | 0x22 | Report Playback Audio Stream Format and Type | XU316→MCU |
     | 0x23 | Set Input/Output Mode | MCU→XU316 |
-    | 0x24 | Send Playback Volume | MCU→XU316 |
-    | 0x25 | Send Recording Volume | MCU→XU316 |
+    | 0x24 | XU316 Send Playback Volume | XU316→MCU |
+    | 0x25 | XU316 Send Recording Volume | XU316→MCU |
     | 0x26 | Switch MCLK | MCU→XU316 |
 
 === "HID-MCU Transparent Transmission Commands (0xEE-0xEF)"
@@ -635,7 +635,7 @@ sequenceDiagram
     ```
 
 === "Function Description"
-    - This command is used by MCU to set current playback volume to XU316
+    - This command is used by XU316 to report current playback volume to MCU
 
 
 #### 3.3.6 Send Recording Volume (0x25)
@@ -662,7 +662,8 @@ sequenceDiagram
     ```
 
 === "Function Description"
-    - This command is used by MCU to set current microphone recording volume to XU316
+    - This command is used by XU316 to report current microphone recording volume to MCU
+    - Reserved command, not currently used
 
 #### 3.3.7 Switch MCLK (0x26)