diff --git a/docs/source/reference/envs.rst b/docs/source/reference/envs.rst
index 065d6a2e3d4..8aad5c5678a 100644
--- a/docs/source/reference/envs.rst
+++ b/docs/source/reference/envs.rst
@@ -846,6 +846,7 @@ to be able to create this other composition:
     SelectTransform
     SignTransform
     SqueezeTransform
+    Stack
     StepCounter
     TargetReturn
     TensorDictPrimer