diff --git a/README.md b/README.md
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+++ b/README.md
@@ -20,6 +20,7 @@ We do not exist on TikTok. No one from the dev team makes TikTok videos.
 
 ## Introduction
 PojavLauncher is a Minecraft: Java Edition launcher for Android based on [Boardwalk](https://github.com/zhuowei/Boardwalk). This launcher can launch almost all available Minecraft versions (from rd-132211 to latest 1.17 snapshot, including Combat Test versions). Modding via Forge and Fabric are also supported.
+- Note that `21w10a` or newer is currently not yet supported due to the new GLSL usage.
 
 ## Building
 To get started, you can just get prebuilt app from [stable release](https://github.com/PojavLauncherTeam/PojavLauncher/releases) or [automatic builds](https://github.com/PojavLauncherTeam/PojavLauncher/actions). If you want to build after launcher code changes, follow steps below.