diff --git a/5.internal-document-search/infra/main.bicep b/5.internal-document-search/infra/main.bicep
index 22276d4..9cc96df 100644
--- a/5.internal-document-search/infra/main.bicep
+++ b/5.internal-document-search/infra/main.bicep
@@ -12,6 +12,8 @@ param location string
 @description('Enable private network access to the backend service')
 param isPrivateNetworkEnabled bool
 
+param principalType string = ''
+
 param appServicePlanName string = ''
 param backendServiceName string = ''
 param resourceGroupName string = ''