diff --git a/release_notes.md b/release_notes.md
index 3112514a9..e62c759a7 100644
--- a/release_notes.md
+++ b/release_notes.md
@@ -8,7 +8,9 @@
 
 ### 🔧 Compatibility Notes
 
-- 
+- We noticed an implicit behavior change for updated Apache HttpClient from `5.5.1` to `5.6`.
+  TLS/SSL connections are now checked for hostname verification on behalf of the provided server certificate.
+  Even with enabled trust-all-certificates flag, connections to servers with mismatching hostnames will be rejected.
 
 ### ✨ New Functionality