diff --git a/protocol.md b/protocol.md
index 0b7edeb..38a7a09 100644
--- a/protocol.md
+++ b/protocol.md
@@ -32,7 +32,7 @@ Two wire UART 115200 8n1
 * bCmd - command, see below
 * bArg - argument, depends on command type
 * bPayload[] - optional command payload, can be empty
-* wChecksumLE - little-endian checksum, 0xFFFF xor (16-bit sum of bytes <bAddr bCmd bArg bPayload[]>)
+* wChecksumLE - little-endian checksum, 0xFFFF xor (16-bit sum of bytes <bLen bAddr bCmd bArg bPayload[]>)
 
 ### Ninebot
 #### Vehicle network
@@ -66,7 +66,7 @@ Two wire UART 115200 8n1
 * bCmd - command, see below
 * bArg - argument, depends on command type
 * bPayload[] - optional command payload, can be empty
-* wChecksumLE - little-endian checksum, 0xFFFF xor (16-bit sum of bytes <bLen bSrcAddr bDstAddr bCmd bArg bPayload[]>)
+* wChecksumLE - little-endian checksum, 0xFFFF xor (16-bit sum of bytes <bSrcAddr bDstAddr bCmd bArg bPayload[]>)
 
 ### Commands
 | bCmd | bArg | bPayload[] | BLE | ESC | BMS | Model | Response bCmd bArg bPayload[] | Description |