diff --git a/docker/Dockerfile.higress b/docker/Dockerfile.higress
index e55494802..d36b59f62 100644
--- a/docker/Dockerfile.higress
+++ b/docker/Dockerfile.higress
@@ -7,6 +7,7 @@ ARG BASE_VERSION=latest
 ARG HUB
 
 # The following section is used as base image if BASE_DISTRIBUTION=debug
+# This base image is provided by istio, see: https://github.com/istio/istio/blob/master/docker/Dockerfile.base
 FROM ${HUB}/base:${BASE_VERSION}
 
 ARG TARGETARCH