diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index 76c6db7..8e92bbb 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -1,17 +1,20 @@
 # Lightweight LNbits dev environment — FakeWallet, no Lightning nodes
 #
 # Usage:
-#   docker compose -f docker-compose.dev.yml up -d
+#   LNBITS_SRC=~/dev/lnbits/demo docker compose -f docker-compose.dev.yml up -d --build
 #   docker compose -f docker-compose.dev.yml logs -f lnbits
 #   docker compose -f docker-compose.dev.yml down
 #
+# LNBITS_SRC defaults to ~/dev/lnbits/demo. Override to use a different branch:
+#   LNBITS_SRC=~/dev/lnbits/dev docker compose -f docker-compose.dev.yml up -d --build
+#
 # LNbits:  http://localhost:5001
 # Fava:    http://localhost:3333
 
 services:
   lnbits:
     hostname: lnbits
-    build: /home/padreug/dev/lnbits/demo
+    build: ${LNBITS_SRC:-/home/padreug/dev/lnbits/demo}
     restart: on-failure
     user: "0:0"
     environment: