diff --git a/random_sets/sets.py b/random_sets/sets.py
index 0dc2cea..d17bcfa 100644
--- a/random_sets/sets.py
+++ b/random_sets/sets.py
@@ -38,8 +38,15 @@ class DataSourceSet(WeightedSet):
 
     def __init__(self, source: Path):
         self.source = DataSource(source.read_text())
+        self._populate()
+
+    def _populate(self):
         super().__init__(*[(key, value) for key, value in self.source.frequencies.items()])
 
+    def set_frequency(self, frequency: str):
+        self.source.set_frequency(frequency)
+        self._populate()
+
     def random(self):
         random_key = super().random()
         return self.source.as_dict()[random_key]