diff --git a/README.md b/README.md
index 7126676d..073fb249 100644
--- a/README.md
+++ b/README.md
@@ -254,6 +254,7 @@ the Wine prefix. Removing the option will revert to the previous behavior.
 | Compat config string  | Environment Variable           | Description  |
 | :-------------------- | :----------------------------- | :----------- |
 |                       | <tt>PROTON_LOG</tt>            | Convenience method for dumping a useful debug log to `$HOME/steam-$APPID.log`. For more thorough logging, use `user_settings.py`. |
+|                       | <tt>PROTON_LOG_ALL_PROCESSES</tt> | Instead of clearing the log for each invocation and only logging the game process, append logging for all process to `$HOME/steam-proton.log` without ever clearing the log. Use with care so you don't run out of hard disk space. |
 |                       | <tt>PROTON_DUMP_DEBUG_COMMANDS</tt> | When running a game, Proton will write some useful debug scripts for that game into `$PROTON_DEBUG_DIR/proton_$USER/`. |
 |                       | <tt>PROTON_DEBUG_DIR</tt>      | Root directory for the Proton debug scripts, `/tmp` by default. |
 | <tt>wined3d</tt>      | <tt>PROTON_USE_WINED3D</tt>    | Use OpenGL-based wined3d instead of Vulkan-based DXVK for d3d11 and d3d10. This used to be called `PROTON_USE_WINED3D11`, which is now an alias for this same option. |
diff --git a/proton b/proton
index 935c32e0..94a666ab 100755
--- a/proton
+++ b/proton
@@ -285,17 +285,21 @@ if "forcelgadd" in config_opts:
     env["WINE_LARGE_ADDRESS_AWARE"] = "1"
 
 lfile = None
-if "SteamGameId" in env:
+if "SteamGameId" in env or "PROTON_LOG_ALL_PROCESSES" in env:
     if env["WINEDEBUG"] != "-all":
-        lfile_path = os.environ["HOME"] + "/steam-" + os.environ["SteamGameId"] + ".log"
-        if os.path.exists(lfile_path):
-            os.remove(lfile_path)
+        if "PROTON_LOG_ALL_PROCESSES" in env:
+            lfile_path = os.environ["HOME"] + "/steam-proton.log"
+        else:
+            lfile_path = os.environ["HOME"] + "/steam-" + os.environ["SteamGameId"] + ".log"
+            if os.path.exists(lfile_path):
+                os.remove(lfile_path)
         lfile = open(lfile_path, "w+")
         lfile.write("======================\n")
         with open(basedir + "/version", "r") as f:
             lfile.write("Proton: " + f.readline().strip() + "\n")
-        lfile.write("SteamGameId: " + env["SteamGameId"] + "\n")
-        lfile.write("Command: " + str(sys.argv[2:]) + "\n")
+        if "SteamGameId" in env:
+            lfile.write("SteamGameId: " + env["SteamGameId"] + "\n")
+        lfile.write("Command: " + str(sys.argv[1:]) + "\n")
         lfile.write("======================\n")
         lfile.flush()
 else: