diff --git a/src/platforms/common/blackpill-f4/blackpill-f4.h b/src/platforms/common/blackpill-f4/blackpill-f4.h
index 430162caff1..ddb82975eef 100644
--- a/src/platforms/common/blackpill-f4/blackpill-f4.h
+++ b/src/platforms/common/blackpill-f4/blackpill-f4.h
@@ -273,7 +273,7 @@ extern bool debug_bmp;
 #define USB_ISR(x) otg_fs_isr(x)
 /*
  * Interrupt priorities. Low numbers are high priority.
- * TIM3 is used for traceswo capture and must be highest priority.
+ * TIM4 is used for traceswo capture and must be highest priority.
  */
 #define IRQ_PRI_USB          (1U << 4U)
 #define IRQ_PRI_USBUSART     (2U << 4U)