diff --git a/adminer/README.md b/adminer/README.md
index 71f29f9ca..61a2a7520 100644
--- a/adminer/README.md
+++ b/adminer/README.md
@@ -14,6 +14,14 @@ WARNING:
 
 -->
 
+# **DEPRECATION NOTICE**
+
+Adminer is [no longer maintained (upstream)](https://www.youtube.com/watch?v=OrOtiu_nfHE&lc=Ugy8pAL8wgAL3_iKkzZ4AaABAg.9pj_kQ2rkuw9pp813OyHha):
+
+> I've stopped working on it but maybe I'll return to it some day.
+
+See also [TimWolla/docker-adminer#147](https://github.com/TimWolla/docker-adminer/issues/147). Users are strongly encouraged to seek alternatives.
+
 # Quick reference
 
 -	**Maintained by**:  
diff --git a/php-zendserver/README.md b/php-zendserver/README.md
index 6ad28b2f4..37c9ecebe 100644
--- a/php-zendserver/README.md
+++ b/php-zendserver/README.md
@@ -14,6 +14,10 @@ WARNING:
 
 -->
 
+# **DEPRECATION NOTICE**
+
+This image is not actively maintained (and [has not been for years](https://github.com/docker-library/official-images/issues?q=label%3Alibrary%2Fphp-zendserver)). It is highly recommended for users to seek out alternatives.
+
 # Quick reference
 
 -	**Maintained by**: