diff --git a/website/source/docs/providers/aws/r/security_group_rule.html.markdown b/website/source/docs/providers/aws/r/security_group_rule.html.markdown
index b77286296f..4a772d1a77 100644
--- a/website/source/docs/providers/aws/r/security_group_rule.html.markdown
+++ b/website/source/docs/providers/aws/r/security_group_rule.html.markdown
@@ -49,6 +49,7 @@ or `egress` (outbound).
      depending on the `type`.
 * `self` - (Optional) If true, the security group itself will be added as
      a source to this ingress rule.
+* `to_port` - (Required) The end range port.
 
 ## Attributes Reference