diff --git a/bin/setup-hg-evolve b/bin/setup-hg-evolve
new file mode 100755
--- /dev/null
+++ b/bin/setup-hg-evolve
@@ -0,0 +1,10 @@
+#!/bin/sh
+set -eu
+
+if [ -d ~/.hgext/evolve ]; then
+  hg -R ~/.hgext/evolve fetch
+else
+  hg clone https://www.mercurial-scm.org/repo/evolve ~/.hgext/evolve
+  printf '[extensions]\nevolve = ~/.hgext/evolve/hgext/evolve.py\n' >> ~/.hgrc.local
+fi
+