diff --git a/ci/docker/switch/Dockerfile b/ci/docker/switch/Dockerfile
index 4118969d0c013cb923e25d289960fec652c08b71..00d3f14144816f62a35ceeee6a2938e6e1237c0f 100644
--- a/ci/docker/switch/Dockerfile
+++ b/ci/docker/switch/Dockerfile
@@ -1,3 +1,6 @@
+# NOTE: the pacman that we use for this target doesn't support
+# to use it on CI and we should pull it from another Docker image.
+
 FROM huyuumi/libc-switch:latest
 
 RUN apt-get update && apt-get install -y --no-install-recommends \