diff --git a/pertpy/metadata/_metadata.py b/pertpy/metadata/_metadata.py
index 3d92417c..4484d4ac 100644
--- a/pertpy/metadata/_metadata.py
+++ b/pertpy/metadata/_metadata.py
@@ -62,7 +62,7 @@ def _warn_unmatch(
             if verbosity > 0:
                 logger.info(
                     f"There are {total_identifiers} identifiers in `adata.obs`."
-                    f"However, {len(unmatched_identifiers)} identifiers can't be found in the {metadata_type} annotation,"
+                    f"However, {len(unmatched_identifiers)} identifiers can't be found in the {metadata_type} annotation, "
                     "leading to the presence of NA values for their respective metadata.\n"
                     f"Please check again: *unmatched_identifiers[:verbosity]..."
                 )