diff --git a/CHANGELOG.md b/CHANGELOG.md
index a0fd6052a8b..6b9aa3f2bbb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -101,6 +101,7 @@ Docs: https://docs.openclaw.ai
 - Telegram/Security: reject Telegram webhook startup when `webhookSecret` is missing or empty (prevents unauthenticated webhook request forgery). Thanks @yueyueL.
 - Security/Windows: avoid shell invocation when spawning child processes to prevent cmd.exe metacharacter injection via untrusted CLI arguments (e.g. agent prompt text).
 - Telegram: set webhook callback timeout handling to `onTimeout: "return"` (10s) so long-running update processing no longer emits webhook 500s and retry storms. (#16763) Thanks @chansearrington.
+- Signal: preserve case-sensitive `group:` target IDs during normalization so mixed-case group IDs no longer fail with `Group not found`. (#16748) Thanks @repfigit.
 - Feishu/Security: harden media URL fetching against SSRF and local file disclosure. (#16285) Thanks @mbelinky.
 - Security/Agents: scope CLI process cleanup to owned child PIDs to avoid killing unrelated processes on shared hosts. Thanks @aether-ai-agent.
 - Security/Agents: enforce workspace-root path bounds for `apply_patch` in non-sandbox mode to block traversal and symlink escape writes. Thanks @p80n-sec.