diff --git a/doc/openwrt.md b/doc/openwrt.md
index d4b1386..0f877a1 100644
--- a/doc/openwrt.md
+++ b/doc/openwrt.md
@@ -7,7 +7,7 @@ On vanilla OpenWrt/LEDE box install software packages:
 ```bash
 opkg update
 opkg install curl openssl-util
-opkg install strongswan-full kmod-crypto-echainiv
+opkg install strongswan-full kmod-crypto-echainiv kmod-crypto-gcm
 ```
 
 When using image builder specify these packages via PACKAGES environment variable.