diff --git a/toscaparser/elements/TOSCA_definition_1_0.yaml b/toscaparser/elements/TOSCA_definition_1_0.yaml
index 6092b10..b42c036 100644
--- a/toscaparser/elements/TOSCA_definition_1_0.yaml
+++ b/toscaparser/elements/TOSCA_definition_1_0.yaml
@@ -529,6 +529,7 @@ capability_types:
       network_name:
         type: string
         required: false
+        default: PRIVATE
       initiator:
         type: string
         required: false