diff --git a/galaxy_importer/schema.py b/galaxy_importer/schema.py
index ad1c6f16..425a5de9 100644
--- a/galaxy_importer/schema.py
+++ b/galaxy_importer/schema.py
@@ -531,7 +531,7 @@ def parse(cls, data):
             try:
                 galaxy_info = LegacyGalaxyInfo(**metadata["galaxy_info"])
             except TypeError as e:
-                raise exc.LegacyRoleSchemaError("unknown field in galaxy_info") from e
+                raise exc.LegacyRoleSchemaError(f"unknown field in galaxy_info: {e}") from e
             dependencies = metadata.get("dependencies", list())
         return cls(galaxy_info, dependencies)