diff --git a/docs/contribute/storage/images/storage-model.excalidraw.png b/docs/contribute/storage/images/storage-model.excalidraw.png
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diff --git a/docs/contribute/storage/images/storage-model.png b/docs/contribute/storage/images/storage-model.png
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diff --git a/docs/contribute/storage/index.rst b/docs/contribute/storage/index.rst
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--- a/docs/contribute/storage/index.rst
+++ b/docs/contribute/storage/index.rst
@@ -11,7 +11,7 @@ Each storages should implement the :class:`Storage <harp_apps.storage.types.stor
 Model
 :::::
 
-.. figure:: ./images/storage-model.png
+.. figure:: ./images/storage-model.excalidraw.png
 
 * a :class:`Transaction <harp.models.Transaction>` represents a transaction that went through the
   proxy. A set of request-response forms a transaction in the case of an HTTP transaction (although the response may