diff --git a/README.md b/README.md
index 24439b2e..6bdc534c 100644
--- a/README.md
+++ b/README.md
@@ -238,8 +238,8 @@ Options:
                                   separately. default: auto)
   --always-granule-id / --never-granule-id
                                   Include the granule id in metadata
-                                  filenames? (default: auto: include only for
-                                  multi-granule files).Beware that multi-
+                                  filenames? (default: auto -- include only
+                                  for multi-granule files). Beware that multi-
                                   granule datasets without a granule id in the
                                   filename will overwrite each-other
   --provider [sinergise.com|esa.int]
diff --git a/eodatasets3/prepare/sentinel_l1_prepare.py b/eodatasets3/prepare/sentinel_l1_prepare.py
index 2092a974..10b1f7d9 100644
--- a/eodatasets3/prepare/sentinel_l1_prepare.py
+++ b/eodatasets3/prepare/sentinel_l1_prepare.py
@@ -550,7 +550,7 @@ def granule_ids(self) -> Optional[List[str]]:
     "always_granule_id",
     is_flag=True,
     default=None,
-    help="Include the granule id in metadata filenames? (default: auto: include only for multi-granule files)."
+    help="Include the granule id in metadata filenames? (default: auto -- include only for multi-granule files). "
     "Beware that multi-granule datasets without a granule id in the filename will overwrite each-other",
 )
 @click.option(