diff --git a/adaptive/learner.py b/adaptive/learner.py
index 70d98adeea66c34b6f60708268a233190fc613c6..43d2e8b4cc2bcece7b3573a283887c3f569f34e5 100644
--- a/adaptive/learner.py
+++ b/adaptive/learner.py
@@ -570,7 +570,7 @@ def _max_disagreement_location_in_simplex(points, values, grad, transform):
 
 
 class Learner2D(BaseLearner):
-    """Sample a 2-D function adaptively.
+    """Learns and predicts a function 'f: ℝ^2 → ℝ'.
 
     Parameters
     ----------