diff --git a/sys/mips/conf/ERL b/sys/mips/conf/ERL
index 2c4fd26ba99c..a0155daaf0b2 100644
--- a/sys/mips/conf/ERL
+++ b/sys/mips/conf/ERL
@@ -53,6 +53,7 @@ options 	SCHED_ULE		# ULE scheduler
 options 	PREEMPTION		# Enable kernel thread preemption
 options 	INET			# InterNETworking
 options 	INET6			# IPv6 communications protocols
+options 	IPSEC			# IP (v4/v6) security
 options 	TCP_HHOOK		# hhook(9) framework for TCP
 options 	SCTP			# Stream Control Transmission Protocol
 options 	FFS			# Berkeley Fast Filesystem
@@ -201,7 +202,7 @@ device		ural		# Ralink Technology RT2500USB wireless NICs
 device		zyd		# ZyDAS zd1211/zd1211b wireless NICs
 
 # crypto subsystem
-device		crypto		# core crypto support
+device		crypto		# core crypto support (required for IPSEC)
 device		cryptodev	# /dev/crypto for access to h/w
 device		cryptocteon	# Octeon coprocessor 2 crypto offload