diff --git a/docs/data-model.rst b/docs/data-model.rst
index 1693ae4..8058c21 100644
--- a/docs/data-model.rst
+++ b/docs/data-model.rst
@@ -1,13 +1,21 @@
 .. _data-model:
 
 Data model
 ==========
 
+.. _swh-merkle-dag:
+.. figure:: images/swh-merkle-dag.svg
+   :width: 1024px
+   :align: center
+
+   Software Heritage archive as a Merkle DAG, augmented with crawling
+   information (click to zoom).
+
 TODO
 
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 incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis
 nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
 consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
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diff --git a/docs/images/.gitignore b/docs/images/.gitignore
new file mode 100644
index 0000000..e9c694c
--- /dev/null
+++ b/docs/images/.gitignore
@@ -0,0 +1,2 @@
+swh-merkle-dag.pdf
+swh-merkle-dag.svg
diff --git a/docs/images/Makefile b/docs/images/Makefile
new file mode 100644
index 0000000..fc8352c
--- /dev/null
+++ b/docs/images/Makefile
@@ -0,0 +1,25 @@
+
+MERKLE_DAG = swh-merkle-dag.svg
+
+BUILD_TARGETS =
+BUILD_TARGETS += $(MERKLE_DAG)
+
+all: $(BUILD_TARGETS)
+
+
+# dia exporters
+
+%.eps: %.dia
+	dia -t eps --export $@ $<
+
+%.svg: %.dia
+	dia -t svg --export $@ $<
+
+# generic converters
+
+%.pdf: %.eps
+	epstopdf $<
+
+
+clean:
+	-rm -f $(BUILD_TARGETS)
diff --git a/docs/images/swh-merkle-dag.dia b/docs/images/swh-merkle-dag.dia
new file mode 100644
index 0000000..3e4ddc9
Binary files /dev/null and b/docs/images/swh-merkle-dag.dia differ