diff --git a/libraries/AP_HAL_ChibiOS/hwdef/OrqaF405Pro/README.md b/libraries/AP_HAL_ChibiOS/hwdef/OrqaF405Pro/README.md
index dd160b135dbdc7..b78866eb3e43fe 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/OrqaF405Pro/README.md
+++ b/libraries/AP_HAL_ChibiOS/hwdef/OrqaF405Pro/README.md
@@ -46,7 +46,7 @@ The PWM is in 3 groups:
 
  - PWM 1,4-6 in group1
  - PWM 2-3 in group2
- - PWM 7-8 in group4
+ - PWM 7-8 in group3
 
 Channels within the same group need to use the same output rate. If
 any channel in a group uses DShot then all channels in the group need