diff --git a/AGENTS.md b/AGENTS.md
index 5f92603..6cb93b6 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -114,6 +114,7 @@
   - `System.Numerics.BigInteger`: unsupported (`InternalCompilerException`).
   - `PeterO.Numbers.EInteger`: unsupported (`InternalCompilerException`).
   - `PeterO.Numbers.ERational`: unsupported (`InternalCompilerException`, lacks remainder API).
+- Prefer XMath in GPU calculations over Math or BitOperations.
 
 ## Patch Preparation Reminders