diff --git a/xmitgcm/mds_store.py b/xmitgcm/mds_store.py
index ea3730f..3e00099 100644
--- a/xmitgcm/mds_store.py
+++ b/xmitgcm/mds_store.py
@@ -636,9 +636,9 @@ def load_from_prefix(self, prefix, iternum=None, extra_metadata=None):
 
         Parameters
         ----------
-        name : string
+        prefix : string
             The name of the grid variable.
-        iternume : int (optional)
+        iternum : int (optional)
             MITgcm iteration number
 
         Yields
@@ -711,7 +711,7 @@ def load_from_prefix(self, prefix, iternum=None, extra_metadata=None):
                     # we didn't find any metadata, so we just skip this var
                     continue
                 else:
-                    raise KeyError("Couln't find metadata for variable %s "
+                    raise KeyError("Couldn't find metadata for variable %s "
                                    "and `ignore_unknown_vars`==False." % vname)
 
             # maybe slice and squeeze the data