diff --git a/arch/arm/src/sama5/sam_sckc.c b/arch/arm/src/sama5/sam_sckc.c
index 05222bcda18..adc96561799 100644
--- a/arch/arm/src/sama5/sam_sckc.c
+++ b/arch/arm/src/sama5/sam_sckc.c
@@ -100,7 +100,7 @@ void sam_sckc_enable(bool enable)
   regval |= SCKC_CR_OSC32EN;
   putreg32(regval, SAM_SCKC_CR);
 
-  /* Wait 5 slow clock cycles for clock stabilization */
+  /* Wait for 32,768 XTAL start-up time */
 
   up_udelay(5 * USEC_PER_SEC / BOARD_SLOWCLK_FREQUENCY);