diff --git a/Dockerfile b/Dockerfile
index 090fe7028..521bbf1a0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,9 @@ WORKDIR /app
 
 # --- Install + Build in one stage ---
 FROM base AS builder
+# CACHE_BUST: change this value to force a full rebuild (busts Docker layer cache)
 ARG CACHE_BUST=8
+RUN echo "Cache bust: ${CACHE_BUST}"
 COPY . .
 RUN pnpm install --no-frozen-lockfile
 ENV NEXT_TELEMETRY_DISABLED=1