diff --git a/cogsworth/sfh.py b/cogsworth/sfh.py
index b9e7269..9080279 100644
--- a/cogsworth/sfh.py
+++ b/cogsworth/sfh.py
@@ -398,7 +398,7 @@ def save(self, file_name, key="sfh"):
 
         # dump it all into the file attrs using yaml
         with h5.File(file_name, "a") as file:
-            file.attrs["cogsworth-f-type"] = "SFH"
+            file.attrs["cogsworth_f_type"] = "SFH"
             file[key].attrs["params"] = yaml.dump(params, default_flow_style=None)