diff --git a/pymbolic/geometric_algebra/primitives.py b/pymbolic/geometric_algebra/primitives.py
index 036194c00b49566fc648a86f60f8ddb27e8232cc..8d7948d4c47792c2ab737ed85754cecb3fad3061 100644
--- a/pymbolic/geometric_algebra/primitives.py
+++ b/pymbolic/geometric_algebra/primitives.py
@@ -79,9 +79,11 @@ class DerivativeSource(_GeometricCalculusExpression):
 
 
 class Derivative(object):
-    """
+    """This mechanism cannot be used to take more than one derivative at a time.
+
     .. autoproperty:: nabla
     .. automethod:: __call__
+    .. automethod:: dnabla
     .. automethod:: resolve
     """
     _next_id = [0]