README: Disincentivize trying the write watch hack

README.md

@@ -279,6 +279,6 @@ the Wine prefix. Removing the option will revert to the previous behavior.
 | <tt>cmdlineappend:</tt>|                               | Append the string after the colon as an argument to the game command. May be specified more than once. Escape commas and backslashes with a backslash. |
 | <tt>d9vk</tt>         | <tt>PROTON_USE_D9VK</tt>       | **Note: Obsoleted in Proton 5.0.** In older versions, use Vulkan-based DXVK instead of OpenGL-based wined3d for d3d9. |
 | <tt>seccomp</tt>      | <tt>PROTON_USE_SECCOMP</tt>    | Enable seccomp-bpf filter to emulate native syscalls, required for some DRM protections to work. |
-| <tt>nowritewatch</tt> | <tt>PROTON_NO_WRITE_WATCH</tt> | Disable support for memory write watches in ntdll. This improves performance for games that heavily use write watches, but can still work without them (e.g. CoreRT-based games). |
+| <tt>nowritewatch</tt> | <tt>PROTON_NO_WRITE_WATCH</tt> | Disable support for memory write watches in ntdll. This is a very dangerous hack and should only be applied if you have verified that the game can operate without write watches. This improves performance for some very specific games (e.g. CoreRT-based games). |
 
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