diff --git a/lib/hx509/hxtool-commands.in b/lib/hx509/hxtool-commands.in
index ef3f23465..513d11b68 100644
--- a/lib/hx509/hxtool-commands.in
+++ b/lib/hx509/hxtool-commands.in
@@ -83,6 +83,11 @@ command = {
 		type = "flag"
 		help = "wrapped out-data in a ContentInfo"
 	}
+	option = {
+		long = "pem"
+		type = "flag"
+		help = "wrap out-data in PEM armor"
+	}
 	option = {
 		long = "detached-signature"
 		type = "flag"