diff --git a/website/docs/language/expressions/references.html.md b/website/docs/language/expressions/references.html.md
index b7db71398..8f874641c 100644
--- a/website/docs/language/expressions/references.html.md
+++ b/website/docs/language/expressions/references.html.md
@@ -152,7 +152,7 @@ or some other value if not:
 module "example" {
   # ...
 
-  name_prefix = "app-${terraform-workspace}"
+  name_prefix = "app-${terraform.workspace}"
 }
 ```