diff --git a/docs/source/developer_guide_implementing_distribution.md b/docs/source/developer_guide_implementing_distribution.md
index 82c01d7996..ae3baa3a0e 100644
--- a/docs/source/developer_guide_implementing_distribution.md
+++ b/docs/source/developer_guide_implementing_distribution.md
@@ -35,6 +35,7 @@ The following snippet illustrates how to create a new `RandomVariable`:
 
 from aesara.tensor.var import TensorVariable
 from aesara.tensor.random.op import RandomVariable
+from typing import List, Tuple
 
 # Create your own `RandomVariable`...
 class BlahRV(RandomVariable):