diff --git a/Dockerfile b/Dockerfile
index 36fc95ae4..8c46b24e4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,10 @@
+#
+# DEPRECATION NOTICE
+#
+# This Dockerfile and the relative image deepset/haystack-cpu
+# have been deprecated in 1.9.0 in favor of:
+# https://github.com/deepset-ai/haystack/tree/main/docker
+#
 FROM python:3.7.4-stretch
 
 WORKDIR /home/user
diff --git a/Dockerfile-GPU b/Dockerfile-GPU
index b05128668..78df0c620 100644
--- a/Dockerfile-GPU
+++ b/Dockerfile-GPU
@@ -1,3 +1,10 @@
+#
+# DEPRECATION NOTICE
+#
+# This Dockerfile and the relative image deepset/haystack-gpu
+# have been deprecated in 1.9.0 in favor of:
+# https://github.com/deepset-ai/haystack/tree/main/docker
+#
 FROM nvidia/cuda:11.1.1-runtime-ubuntu20.04
 
 WORKDIR /home/user
diff --git a/Dockerfile-GPU-minimal b/Dockerfile-GPU-minimal
index 40996d76e..150fc9866 100644
--- a/Dockerfile-GPU-minimal
+++ b/Dockerfile-GPU-minimal
@@ -1,3 +1,10 @@
+#
+# DEPRECATION NOTICE
+#
+# This Dockerfile and the relative image deepset/haystack-gpu:minimal
+# have been deprecated in 1.9.0 in favor of:
+# https://github.com/deepset-ai/haystack/tree/main/docker
+#
 FROM nvidia/cuda:11.3.1-runtime-ubuntu20.04
 
 WORKDIR /home/user