diff --git a/workflow.rst b/workflow.rst
index 389231ba91a..05c4a7dd385 100644
--- a/workflow.rst
+++ b/workflow.rst
@@ -194,7 +194,10 @@ The configured property will be used via its implemented getter/setter methods b
preferable to not configure it.
A single state marking store uses a ``string`` to store the data. A multiple
- state marking store uses an ``array`` to store the data.
+ state marking store uses an ``array`` to store the data. On both cases if no
+ state marking store is defined you have to return ``null``. So in the above
+ example should be defined a return type like ``App\Entity\BlogPost::getCurrentPlace(): ?array``
+ or like ``App\Entity\BlogPost::getCurrentPlace(): ?string``.
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