diff --git a/bionty/base/_public_ontology.py b/bionty/base/_public_ontology.py
index e2016a1..80ede5c 100644
--- a/bionty/base/_public_ontology.py
+++ b/bionty/base/_public_ontology.py
@@ -473,14 +473,14 @@ def standardize(
             return_mapper: `bool = False` If `True`, returns `{input_synonym1:
                 standardized_name1}`.
             case_sensitive: `bool = False` Whether the mapping is case sensitive.
-            keep: `Literal["first", "last", False] = "first"` When a synonym maps to
-                multiple names, determines which duplicates to mark as
-                `pd.DataFrame.duplicated`
+            keep: {'first', 'last', False}, default 'first'.
+                When a synonym maps to multiple standardized values, determines
+                which duplicates to mark as `pandas.DataFrame.duplicated`.
+
+                - "first": returns the first mapped standardized value
+                - "last": returns the last mapped standardized value
+                - False: returns all mapped standardized value
             mute: Whether to mute logging. Defaults to False.
-            Keep: Which standardized name to keep.
-                    - "first": returns the first mapped standardized name
-                    - "last": returns the last mapped standardized name
-                    - `False`: returns all mapped standardized name
             synonyms_field: `str = "synonyms"` A field containing the concatenated synonyms.
 
         Returns:
diff --git a/bionty/models.py b/bionty/models.py
index e429c5c..e76e4b7 100644
--- a/bionty/models.py
+++ b/bionty/models.py
@@ -554,6 +554,9 @@ class Gene(BioRecord, TracksRun, TracksUpdates):
         Bulk create Gene records via :meth:`~docs:lamindb.core.CanValidate.from_values`.
         Map legacy ensembl IDs to current ensembl IDs using :meth:`bionty.base.Gene.map_legacy_ids`.
 
+        We discourage validating gene symbols and to work with unique identifiers such as ENSEMBL IDs instead.
+        For more details, see :doc:`docs:faq/symbol-mapping`.
+
     Examples:
         >>> record = bionty.Gene.from_source(symbol="TCF7", organism="human")
     """