diff --git a/actions/ost-compare-structures b/actions/ost-compare-structures
index 067d154df5ff73a1f9b592f6b0527c64d9508293..9fc39ace572f4f3dccd27dbb030dae18218703c7 100644
--- a/actions/ost-compare-structures
+++ b/actions/ost-compare-structures
@@ -630,7 +630,7 @@ def _ParseArgs():
         dest="lddt_add_mdl_contacts",
         default=False,
         action="store_true",
-        help=("Only using contacts in lDDT that"
+        help=("Only using contacts in lDDT that "
               "are within a certain distance threshold in the "
               "reference does not penalize for added model "
               "contacts. If set to True, this flag will also "