diff --git a/README.md b/README.md
index ab8d1935..728abff5 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,11 @@
 [![Discord](https://img.shields.io/badge/Discord-join.svg?style=flat&labelColor=100F0F&color=8B7EC8&logo=discord&logoColor=FFFCF0)](https://discord.gg/ZYRSdnwwKA)
 [![Support the project](https://img.shields.io/badge/Support-Project-black?style=flat&labelColor=100F0F&color=EC8B49&logo=ko-fi&logoColor=FFFCF0)](https://ko-fi.com/G2G41SAWNS)
 
+> [!IMPORTANT]
+> **Desktop users:** Please re-download and reinstall **OpenChamber v1.8.6** from [GitHub Releases](https://github.com/btriapitsyn/openchamber/releases).
+> We rotated the desktop updater signing key after moving the repository to the organization, so in-app auto-update from older desktop builds may fail signature verification.
+> This is a one-time reinstall and does not affect app functionality.
+
 ## **OpenCode, everywhere.** Desktop. Browser. Phone.
 
 ### A rich interface for [OpenCode](https://opencode.ai). Review diffs, manage agents, run dev servers, and keep the big picture while your AI codes.