diff --git a/devel/open-ath9k-htc-firmware/Makefile.inc b/devel/open-ath9k-htc-firmware/Makefile.inc
index a0635e9ee65..3089c787a12 100644
--- a/devel/open-ath9k-htc-firmware/Makefile.inc
+++ b/devel/open-ath9k-htc-firmware/Makefile.inc
@@ -1,3 +1,4 @@
+# if this port is updated, sysutils/firmware/athn must be bumped
 PKGNAME ?=	open-ath9k-htc-firmware-${ATH9K_FIRMWARE}-1.4.0pl20171105
 DISTNAME ?=	${GH_PROJECT}-${GH_COMMIT}
 
diff --git a/devel/open-ath9k-htc-firmware/k2/Makefile b/devel/open-ath9k-htc-firmware/k2/Makefile
index 9469a598525..8e39ff305d8 100644
--- a/devel/open-ath9k-htc-firmware/k2/Makefile
+++ b/devel/open-ath9k-htc-firmware/k2/Makefile
@@ -1,5 +1,6 @@
 COMMENT =		free firmware for Atheros AR9271
 
+# if this port is updated, sysutils/firmware/athn must be bumped
 ATH9K_FIRMWARE =	k2
 REVISION =		0
 
diff --git a/devel/open-ath9k-htc-firmware/magpie/Makefile b/devel/open-ath9k-htc-firmware/magpie/Makefile
index 83e8079ea1a..05c1db2727c 100644
--- a/devel/open-ath9k-htc-firmware/magpie/Makefile
+++ b/devel/open-ath9k-htc-firmware/magpie/Makefile
@@ -1,5 +1,6 @@
 COMMENT =		free firmware for Atheros AR7010
 
+# if this port is updated, sysutils/firmware/athn must be bumped
 ATH9K_FIRMWARE =	magpie
 
 CONFIGURE_ARGS +=	-DTARGET_MAGPIE=On