diff --git a/arch/arm/src/stm32/stm32_foc.c b/arch/arm/src/stm32/stm32_foc.c
index 9d67ead8c3..956049fbd5 100644
--- a/arch/arm/src/stm32/stm32_foc.c
+++ b/arch/arm/src/stm32/stm32_foc.c
@@ -222,7 +222,7 @@
 /* FOC ADC trigger on CCR4 **************************************************/
 
 /* PWM channels configuration:
- *   - n channels for phases PWM (CCR1, CCR2, CCR3)
+ *   - 3 channels for phases PWM (CCR1, CCR2, CCR3)
  *   - 1 channel for ADC injection sequence trigger (CCR4)
  */