diff --git a/docs/source/reference/envs.rst b/docs/source/reference/envs.rst
index 9b5bcadd433..c4f3f6eda9a 100644
--- a/docs/source/reference/envs.rst
+++ b/docs/source/reference/envs.rst
@@ -848,6 +848,7 @@ to be able to create this other composition:
     SelectTransform
     SignTransform
     SqueezeTransform
+    Stack
     StepCounter
     TargetReturn
     TensorDictPrimer