diff --git a/src/main/python/ddadevops/release_mixin/domain.py b/src/main/python/ddadevops/release_mixin/domain.py
index a95e847..c7cf406 100644
--- a/src/main/python/ddadevops/release_mixin/domain.py
+++ b/src/main/python/ddadevops/release_mixin/domain.py
@@ -8,6 +8,9 @@ class ReleaseType(Enum):
     SNAPSHOT = 3
     BUMP = None
 
+class EnvironmentKeys(Enum):
+    DDADEVOPS_RELEASE_TYPE = 0
+
 class Version():
 
     def __init__(self, id: Path, version_list: list):