diff --git a/doc/services.txt b/doc/services.txt
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--- /dev/null
+++ b/doc/services.txt
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+# This file documents the attribution of the services ports in the SWH
+# infrastructure. When you add a service that adds a default listening port,
+# add it to this file.
+
+swh-storage: 5002
+swh-objstorage: 5003
+swh-web-ui: 5004
+swh-storage-vault: 5005
+
+# Edit this line with your nick to get a merge conflict if there's an overlap
+# Next available ID (seirl) : 5006