diff --git a/dockerfile b/dockerfile
index 595d99f0..ac522739 100644
--- a/dockerfile
+++ b/dockerfile
@@ -1,6 +1,7 @@
 FROM node:14-alpine3.14
 
 # sqlite have to build on arm
+# TODO: use prebuilt sqlite for arm, because it is very very slow.
 RUN apk add --no-cache make g++ python3
 RUN ln -s /usr/bin/python3 /usr/bin/python