diff --git a/proton b/proton
index c654315d..ea5a573f 100755
--- a/proton
+++ b/proton
@@ -996,12 +996,14 @@ class Session:
             self.env.setdefault("WINEDEBUG", "+timestamp,+pid,+tid,+seh,+debugstr,+loaddll,+mscoree")
             self.env.setdefault("DXVK_LOG_LEVEL", "info")
             self.env.setdefault("VKD3D_DEBUG", "warn")
+            self.env.setdefault("VKD3D_SHADER_DEBUG", "fixme")
             self.env.setdefault("WINE_MONO_TRACE", "E:System.NotImplementedException")
 
         #for performance, logging is disabled by default; override with user_settings.py
         self.env.setdefault("WINEDEBUG", "-all")
         self.env.setdefault("DXVK_LOG_LEVEL", "none")
         self.env.setdefault("VKD3D_DEBUG", "none")
+        self.env.setdefault("VKD3D_SHADER_DEBUG", "none")
 
         #disable XIM support until libx11 >= 1.7 is widespread
         self.env.setdefault("WINE_ALLOW_XIM", "0")
diff --git a/user_settings.sample.py b/user_settings.sample.py
index fdb9c30c..570fd0c2 100755
--- a/user_settings.sample.py
+++ b/user_settings.sample.py
@@ -15,6 +15,9 @@ user_settings = {
     #vkd3d debug logging
     "VKD3D_DEBUG": "warn",
 
+    #vkd3d-shader debug logging
+    "VKD3D_SHADER_DEBUG": "fixme",
+
     #wine-mono debug logging (Wine's .NET replacement)
     "WINE_MONO_TRACE": "E:System.NotImplementedException",
     #"MONO_LOG_LEVEL": "info",