diff --git a/debian/README.source b/debian/README.source
new file mode 100644
index 000000000..57cbd3779
--- /dev/null
+++ b/debian/README.source
@@ -0,0 +1,21 @@
+NMUs are welcome
+
+
+Use something like the script below to update from Git
+
+
+#!/bin/bash
+
+VERSION=6.3~svn680
+
+echo "*.jar export-ignore" > .gitattributes
+
+git archive --worktree-attributes \
+    --format tar \
+    --prefix libphonenumber/ \
+    -o ../libphonenumber_${VERSION}.orig.tar \
+    master
+
+cd ..
+
+bzip2 libphonenumber_${VERSION}.orig.tar