diff --git a/src/specklepy/core/api/inputs/version_inputs.py b/src/specklepy/core/api/inputs/version_inputs.py
index d5ab7e5..8bc2b03 100644
--- a/src/specklepy/core/api/inputs/version_inputs.py
+++ b/src/specklepy/core/api/inputs/version_inputs.py
@@ -34,4 +34,8 @@ class MarkReceivedVersionInput(GraphQLBaseModel):
     version_id: str
     project_id: str
     source_application: str
+    """
+    IMPORTANT: this is meant to be the slug of the application that has done the
+    receiving, not to be confused with `Version.sourceApplication`
+    """
     message: Optional[str] = None