diff --git a/mmv1/third_party/terraform/website/docs/r/google_service_account_key.html.markdown b/mmv1/third_party/terraform/website/docs/r/google_service_account_key.html.markdown
index bdc52ffffc69..28caf8afcb4f 100644
--- a/mmv1/third_party/terraform/website/docs/r/google_service_account_key.html.markdown
+++ b/mmv1/third_party/terraform/website/docs/r/google_service_account_key.html.markdown
@@ -83,7 +83,9 @@ The following arguments are supported:
 
 * `service_account_id` - (Required) The Service account id of the Key. This can be a string in the format
 `{ACCOUNT}` or `projects/{PROJECT_ID}/serviceAccounts/{ACCOUNT}`, where `{ACCOUNT}` is the **full** email address of the
-service account. If the `{ACCOUNT}` syntax is used, the project will be inferred from the account.
+service account. If the `{ACCOUNT}` syntax is used, the project will be inferred from the account. Likewise,
+if the `projects/{PROJECT_ID}/serviceAccounts/{ACCOUNT}` syntax is used, substituting `-` as a wildcard for the
+`{PROJECT_ID}` will infer the project from the account.
 
 * `key_algorithm` - (Optional) The algorithm used to generate the key. KEY_ALG_RSA_2048 is the default algorithm.
 Valid values are listed at