diff --git a/main.tf b/main.tf
index 66b1033..a645c86 100644
--- a/main.tf
+++ b/main.tf
@@ -23,7 +23,7 @@ resource "openstack_networking_secgroup_rule_v2" "ingress" {
   security_group_id = openstack_networking_secgroup_v2.this.id
   tenant_id         = var.tenant_id
 
-  description      = try(each.value.description, false) != false ? each.value.description : null
+  description      = try(each.value.description, false) != false ? each.value.description : "Terraform managed."
   ethertype        = try(each.value.ethertype, false) != false ? each.value.ethertype : "IPv4"
   protocol         = try(each.value.protocol, false) != false ? each.value.protocol : "tcp"
   port_range_min   = try(each.value.port_range_min, false) != false ? each.value.port_range_min : null
@@ -39,7 +39,7 @@ resource "openstack_networking_secgroup_rule_v2" "egress" {
   security_group_id = openstack_networking_secgroup_v2.this.id
   tenant_id         = var.tenant_id
 
-  description      = try(each.value.description, false) != false ? each.value.description : null
+  description      = try(each.value.description, false) != false ? each.value.description : "Terraform managed."
   ethertype        = try(each.value.ethertype, false) != false ? each.value.ethertype : "IPv4"
   protocol         = try(each.value.protocol, false) != false ? each.value.protocol : "tcp"
   port_range_min   = try(each.value.port_range_min, false) != false ? each.value.port_range_min : null