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-rw-r--r--docs/filters.rst4
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diff --git a/docs/filters.rst b/docs/filters.rst
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@@ -751,7 +751,9 @@ Stacking
.. gobj:class:: stack
Symmetrical to the slice filter, the stack filter stacks two-dimensional
- input.
+ input. If ``number`` is not a divisor of the number of input images, the
+ last produced stack at index which starts to exceed the number of input
+ images will contain arbitrary images from the previous iterations.
.. gobj:prop:: number:uint