diff --git a/actions/ost-compare-ligand-structures b/actions/ost-compare-ligand-structures
index 0a82242cdc00cf8ad9a19774e410ec9bc1763737..a221d950be4b0e95c42bc7e1269d32f7dcc5a8d9 100644
--- a/actions/ost-compare-ligand-structures
+++ b/actions/ost-compare-ligand-structures
@@ -202,16 +202,16 @@ def _ParseArgs():
         "-cd",
         "--coverage-delta",
         dest="coverage_delta",
-        default=False,
-        action="store_true",
-        help=("Allow incomplete target ligands."))
+        default=0.2,
+        help=("Coverage delta for partial ligand assignment."))
 
     parser.add_argument(
         "-gcm",
         "--global-chain-mapping",
         dest="global_chain_mapping",
-        default=0.2,
-        help=("Coverage delta for partial ligand assignment."))
+        default=False,
+        action="store_true",
+        help=("Use a global chain mapping."))
 
     parser.add_argument(
         "-c",