diff --git a/README.md b/README.md
index bcd3d312..5fb23d67 100644
--- a/README.md
+++ b/README.md
@@ -279,5 +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). |
 
 <!-- Target:  GitHub Flavor Markdown.  To test locally:  pandoc -f markdown_github -t html README.md  -->
diff --git a/proton b/proton
index f39c2b15..81838204 100755
--- a/proton
+++ b/proton
@@ -491,6 +491,7 @@ class Session:
         self.check_environment("PROTON_FORCE_LARGE_ADDRESS_AWARE", "forcelgadd")
         self.check_environment("PROTON_OLD_GL_STRING", "oldglstr")
         self.check_environment("PROTON_USE_SECCOMP", "seccomp")
+        self.check_environment("PROTON_NO_WRITE_WATCH", "nowritewatch")
 
         if "noesync" in self.compat_config:
             self.env.pop("WINEESYNC", "")
@@ -505,6 +506,9 @@ class Session:
         if "seccomp" in self.compat_config:
             self.env["WINESECCOMP"] = "1"
 
+        if "nowritewatch" in self.compat_config:
+            self.env["WINE_DISABLE_WRITE_WATCH"] = "1"
+
         if "oldglstr" in self.compat_config:
             #mesa override
             self.env["MESA_EXTENSION_MAX_YEAR"] = "2003"