diff --git a/website/docs/r/sql_database_instance.html.markdown b/website/docs/r/sql_database_instance.html.markdown
index cb7fade3..b8bdc4e3 100644
--- a/website/docs/r/sql_database_instance.html.markdown
+++ b/website/docs/r/sql_database_instance.html.markdown
@@ -116,7 +116,7 @@ The optional `settings.backup_configuration` subblock supports:
 The optional `settings.ip_configuration` subblock supports:
 
 * `ipv4_enabled` - (Optional) True if the instance should be assigned an IP
-    address.
+    address. The IPv4 address cannot be disabled for Second Generation instances.
 
 * `require_ssl` - (Optional) True if mysqld should default to `REQUIRE X509`
     for users connecting over IP.