diff --git a/harvester/harvester.py b/harvester/harvester.py
index 24f19c7..06ee8d9 100644
--- a/harvester/harvester.py
+++ b/harvester/harvester.py
@@ -15,9 +15,12 @@ def sanitize_name(name: str) -> str:
     """Sanitize a name to be filesystem-friendly."""
     return name.lower().replace(" ", "-").replace("_", "-")
 
-def harvest_readmes(organization: str, branch: list[str | None] = ["main", "dev", None], projects: list[str] = [], output_path: str = "reference") -> None:
+def harvest_readmes(organization: str | Organization, branch: list[str | None] = ["main", "dev", None], projects: list[str] = [], output_path: str = "reference") -> None:
     """Harvest README files from repositories."""
-    org = Organization("https://dev.azure.com/" + organization, token=get_token())
+    if isinstance(organization, str):
+        org = Organization("https://dev.azure.com/" + organization, token=get_token())
+    else:
+        org = organization
 
     if projects:
         # Target specific projects