diff --git a/src/Models/ReactionOptions.cs b/src/Models/ReactionOptions.cs
index 604fd3f..d823bcb 100644
--- a/src/Models/ReactionOptions.cs
+++ b/src/Models/ReactionOptions.cs
@@ -22,6 +22,9 @@ private enum OpType
         private readonly List<OpType> _ops;
         private readonly List<string> _kindFilters;
 
+        private string _userId;
+        private string _childrenUserId;
+
         private ReactionOption()
         {
             _ops = new List<OpType>();
@@ -45,6 +48,12 @@ internal void Apply(RestRequest request)
 
             if (_kindFilters.Count != 0)
                 request.AddQueryParameter("reactionKindsFilter", string.Join(",", _kindFilters));
+
+            if (!string.IsNullOrWhiteSpace(_userId))
+                request.AddQueryParameter("filter_user_id", _userId);
+
+            if (!string.IsNullOrWhiteSpace(_childrenUserId))
+                request.AddQueryParameter("children_user_id", _userId);
         }
 
         public static ReactionOption With()
@@ -87,5 +96,17 @@ public ReactionOption KindFilter(string value)
             _kindFilters.Add(value);
             return this;
         }
+
+        public ReactionOption UserFilter(string value)
+        {
+            _userId = value;
+            return this;
+        }
+
+        public ReactionOption ChildrenUserFilter(string value)
+        {
+            _childrenUserId = value;
+            return this;
+        }
     }
 }