diff --git a/MANIFEST.in b/MANIFEST.in
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,4 @@
 include Makefile
 include requirements.txt
+include requirements-swh.txt
 include version.txt
diff --git a/requirements-swh.txt b/requirements-swh.txt
new file mode 100644
--- /dev/null
+++ b/requirements-swh.txt
@@ -0,0 +1 @@
+# Add here internal Software Heritage dependencies, one per line.