diff --git a/r/compute_network.html.markdown b/r/compute_network.html.markdown
index bd982055..22440899 100644
--- a/r/compute_network.html.markdown
+++ b/r/compute_network.html.markdown
@@ -29,14 +29,15 @@ The following arguments are supported:
* `ipv4_range` - (Optional) The IPv4 address range that machines in this
network are assigned to, represented as a CIDR block. If not
set, an auto or custom subnetted network will be created, depending
- on the value of `auto_create_subnetworks` attribute.
+ on the value of `auto_create_subnetworks` attribute. This attribute
+ may not be used if `auto_create_subnets` is specified.
* `auto_create_subnetworks` - (Optional) If set to true, this network
will be created in auto subnet mode, and Google will create a
subnet for each region automatically.
If set to false, and `ipv4_range` is not set, a custom subnetted
network will be created that can support `google_compute_subnetwork`
- resources.
+ resources. This attribute may not be used if `ipv4_range` is specified.
## Attributes Reference