diff --git a/src/main.cpp b/src/main.cpp
index 63f5ae9..f7151e2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -86,6 +86,7 @@ const struct option *gamescope_options = (struct option[]){
 	{ "force-orientation", required_argument, nullptr, 0 },
 
 	{ "hdr-enabled", no_argument, nullptr, 0 },
+	{ "hdr-sdr-content-nits", required_argument, nullptr, 0 },
 	{ "hdr-wide-gammut-for-sdr", no_argument, nullptr, 0 },
 	{ "hdr-debug-force-support", no_argument, nullptr, 0 },
 	{ "hdr-debug-force-output", no_argument, nullptr, 0 },
@@ -122,6 +123,7 @@ const char usage[] =
 	"  --hdr-enabled                  enable HDR output (needs Gamescope WSI layer enabled for support from clients)\n"
 	"                                 If this is not set, and there is a HDR client, it will be tonemapped SDR.\n"
 	"  --hdr-wide-gammut-for-sdr      treat SDR sRGB content as having Rec.2020 primaries. Makes colors more vivid at cost of 'correctness'.\n"
+	"  --hdr-sdr-content-nits		  set the luminance of SDR content in nits. Default: 400 nits.\n"
 	"\n"
 	"Nested mode options:\n"
 	"  -o, --nested-unfocused-refresh game refresh rate when unfocused\n"
diff --git a/src/steamcompmgr.cpp b/src/steamcompmgr.cpp
index f698b15..4868d27 100644
--- a/src/steamcompmgr.cpp
+++ b/src/steamcompmgr.cpp
@@ -5536,6 +5536,7 @@ extern int g_nPreferredOutputWidth;
 extern int g_nPreferredOutputHeight;
 
 static bool g_bWasFSRActive = false;
+extern float g_flLinearToNits;
 
 extern std::atomic<uint64_t> g_nCompletedPageFlipCount;
 
@@ -5595,6 +5596,8 @@ steamcompmgr_main(int argc, char **argv)
 					g_FadeOutDuration = atoi(optarg);
 				} else if (strcmp(opt_name, "hdr-enabled") == 0) {
 					g_bHDREnabled = true;
+				} else if (strcmp(opt_name, "hdr-sdr-content-nits") == 0) {
+					g_flLinearToNits = atof(optarg);
 				} else if (strcmp(opt_name, "hdr-debug-force-support") == 0) {
 					g_bForceHDRSupportDebug = true;
  				} else if (strcmp(opt_name, "hdr-debug-force-output") == 0) {