diff --git a/filters/toxicity/filter.py b/filters/toxicity/filter.py
index f958e8c54..9d6210976 100644
--- a/filters/toxicity/filter.py
+++ b/filters/toxicity/filter.py
@@ -18,16 +18,30 @@ class ToxicityTypes(str, enum.Enum):
 
 
 class ToxicityFilter(SentenceOperation):
+
+    """
+    Filter to select sentences based on their toxicity.
+    """
+
     tasks = [TaskType.TEXT_TO_TEXT_GENERATION]
     languages = ["en"]
+    keywords = ["semantic", "social-reasoning"]
     heavy = True
 
     def __init__(
         self,
-        toxicity_type: ToxicityTypes,
+        toxicity_type: ToxicityTypes = ToxicityTypes.TOXICITY,
         op: str = ">",
         threshold: float = 0.5,
     ):
+        """
+        Initialize filter by specifying the type and threshold values for toxicity.
+        :param toxicity_type: One of ToxicityTypes.TOXICITY, ToxicityTypes.SEVERE_TOXICITY,
+                              ToxicityTypes.OBSCENE, ToxicityTypes.IDENTITY_ATTACK,
+                              ToxicityTypes.INSULT, ToxicityTypes.THREAT, ToxicityTypes.SEXUAL_EXPLICIT
+        :param op: Operator to compare the toxicity value to the threshold. One of ">", "<", ">=", "<=", "==".
+        :param threshold: A float value between 0.0 and 1.0 for comparing toxicity of an input text.
+        """
         super().__init__()
 
         self.check_threshold_value(threshold)