diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index e41b00edf2f6..39446fba06b3 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -1245,6 +1245,12 @@ options 	CAPABILITY_MODE	# sandboxes with no global namespace access
 
 options 	HZ=100
 
+# Enable support for the kernel PLL to use an external PPS signal,
+# under supervision of [x]ntpd(8)
+# More info in ntpd documentation: http://www.eecis.udel.edu/~ntp
+
+options 	PPS_SYNC
+
 # Enable support for generic feed-forward clocks in the kernel.
 # The feed-forward clock support is an alternative to the feedback oriented
 # ntpd/system clock approach, and is to be used with a feed-forward
diff --git a/sys/powerpc/conf/NOTES b/sys/powerpc/conf/NOTES
index 1a0c70fb08f9..78d990331ead 100644
--- a/sys/powerpc/conf/NOTES
+++ b/sys/powerpc/conf/NOTES
@@ -46,8 +46,6 @@ options 	PSIM			#GDB PSIM ppc simulator
 options 	MAMBO			#IBM Mambo Full System Simulator
 options		QEMU			#QEMU processor emulator
 
-options 	PPS_SYNC
-
 # The cpufreq(4) driver provides support for CPU frequency control
 device		cpufreq
 
diff --git a/sys/riscv/conf/NOTES b/sys/riscv/conf/NOTES
index 60e842ab2709..7dda89bfe1a8 100644
--- a/sys/riscv/conf/NOTES
+++ b/sys/riscv/conf/NOTES
@@ -20,8 +20,6 @@ options 	FPE			# Floating-point extension support
 options 	RACCT_DEFAULT_TO_DISABLED # Set kern.racct.enable=0 by default
 options 	INTRNG			# Include INTRNG framework
 
-options 	PPS_SYNC
-
 # RISC-V SBI console
 device		rcons