diff --git a/ehrapy/tools/feature_ranking/_rank_features_groups.py b/ehrapy/tools/feature_ranking/_rank_features_groups.py
index 31ab66b2..9be05f09 100644
--- a/ehrapy/tools/feature_ranking/_rank_features_groups.py
+++ b/ehrapy/tools/feature_ranking/_rank_features_groups.py
@@ -325,7 +325,6 @@ def rank_features_groups(
          >>> ep.tl.rank_features_groups(adata, "service_unit")
          >>> ep.pl.rank_features_groups(adata)
     """
-    # if rank_obs_columns is indicated, layer must be None
     if layer is not None and rank_obs_columns is not None:
         raise ValueError("Only one of layer and rank_obs_columns can be specified.")