diff --git a/firmware/target/arm/as3525/clock-target.h b/firmware/target/arm/as3525/clock-target.h
index 7dab0378ad..c9b2ceb9a4 100644
--- a/firmware/target/arm/as3525/clock-target.h
+++ b/firmware/target/arm/as3525/clock-target.h
@@ -49,7 +49,7 @@
 #define AS3525_CLK_MAIN           0
 #define AS3525_CLK_PLLA           1
 //#define AS3525_CLK_PLLB           2
-#define AS3525_CLK_FCLK           3         /* for synchronous bus only  */
+#define AS3525_CLK_FCLK           3         /* Available as PCLK input only  */
 
 /* PLL  frequencies and settings*/