diff --git a/website/docs/configuration-options.md b/website/docs/configuration-options.md
index 4def1380352a8fbbe0d8adb33bac2f342903e898..734f3686858740460de762b6aa2d64816cf053f7 100644
--- a/website/docs/configuration-options.md
+++ b/website/docs/configuration-options.md
@@ -808,7 +808,25 @@ Language support is limited to those listed below:
 
 ## terraform
 
-Currently terraform support is limited to github sources with semver refs, e.g. like `github.com/hashicorp/example?ref=v1.0.0`.
+Currently Terraform support is limited to Terraform registry sources and github sources that include semver refs, e.g. like `github.com/hashicorp/example?ref=v1.0.0`.
+
+Fixed versions like the following will receive a PR whenever there is a newer version available:
+
+```
+module "consul" {
+  source  = "hashicorp/consul/aws"
+  version = "0.0.5"
+  servers = 3
+}
+```
+
+The following _range_ constraints are also supported:
+
+- `>= 1.2.0`: version 1.2.0 or newer
+- `<= 1.2.0`: version 1.2.0 or older
+- `~> 1.2.0`: any non-beta version >= 1.2.0 and < 1.3.0, e.g. 1.2.X
+- `~> 1.2`: any non-beta version >= 1.2.0 and < 2.0.0, e.g. 1.X.Y
+- `>= 1.0.0`, <= 2.0.0`: any version between 1.0.0 and 2.0.0 inclusive
 
 ## timezone