diff --git a/docs/Complete_list_of_command_line_parameters.htm b/docs/Complete_list_of_command_line_parameters.htm
index c2a0fbc4..b5c72807 100644
--- a/docs/Complete_list_of_command_line_parameters.htm
+++ b/docs/Complete_list_of_command_line_parameters.htm
@@ -140,6 +140,7 @@ td.formatted_questions ol { margin-top: 0px; margin-bottom: 0px; }
 		<li><strong><code>-flares</code>:</strong> Turn on support for flares</li>
 		<li><strong><code>-flat</code>:</strong> Enable flat shading (good for combining with -celshader)</li>
 		<li><strong><code>-fulldetail</code>:</strong> Treat detail brushes as structural ones</li>
+		<li><strong><code>-globalflag</code> surfaceparm:</strong> Add surface flag to every bsp shader. Reusable, e.g. -globalflag slick -globalflag nodamage.</li>
 		<li><strong><code>-keeplights</code>:</strong> Keep light entities in the BSP file after compile</li>
 		<li><strong><code>-keepmodels</code>:</strong> Keep misc_model entities in the BSP file after compile</li>
 		<li><strong><code>-leaktest</code>:</strong> Abort if a leak was found</li>
diff --git a/docs/changelog-custom.txt b/docs/changelog-custom.txt
index 2fb42ad7..ccccd6df 100644
--- a/docs/changelog-custom.txt
+++ b/docs/changelog-custom.txt
@@ -177,6 +177,7 @@ Q3map2:
 	* generate shaders to force nomipmaps flag on external lightmap images created by lightstyles and external lms hacks
 	* -nobrushsnap: disable brush vertices snapping (of drawsurfs) (experimental, keep eye on meta merge efficiency)
 	* improved brush faces triangulation wrt degenerate triangles production (non -maxarea algorithm)
+	* -globalflag <surfaceparm>: add surface flag to every bsp shader. Reusable, e.g. -globalflag slick -globalflag nodamage.
 
 
 
diff --git a/tools/quake3/q3map2/bsp.cpp b/tools/quake3/q3map2/bsp.cpp
index 2dabdcc9..56ff189a 100644
--- a/tools/quake3/q3map2/bsp.cpp
+++ b/tools/quake3/q3map2/bsp.cpp
@@ -867,6 +867,10 @@ int BSPMain( Args& args ){
 			Sys_Printf( "No oBs!\n" );
 			g_noob = true;
 		}
+		while ( args.takeArg( "-globalflag" ) ) {
+			ApplySurfaceParm( args.takeNext(), nullptr, &g_globalSurfaceFlags, nullptr );
+			Sys_Printf( "g_globalSurfaceFlags: 0x%.8X\n", g_globalSurfaceFlags );
+		}
 		while ( args.takeArg( "-autocaulk" ) ) {
 			Sys_Printf( "\trunning in autocaulk mode\n" );
 			g_autocaulk = true;
diff --git a/tools/quake3/q3map2/help.cpp b/tools/quake3/q3map2/help.cpp
index c72b8722..87f115c8 100644
--- a/tools/quake3/q3map2/help.cpp
+++ b/tools/quake3/q3map2/help.cpp
@@ -101,6 +101,7 @@ static void HelpBsp()
 		{"-flares", "Turn on support for flares"},
 		{"-flat", "Enable flat shading (good for combining with -celshader)"},
 		{"-fulldetail", "Treat detail brushes as structural ones"},
+		{"-globalflag <surfaceparm>", "Add surface flag to every bsp shader. Reusable, e.g. -globalflag slick -globalflag nodamage."},
 		{"-keeplights", "Keep light entities in the BSP file after compile"},
 		{"-keepmodels", "Keep misc_model entities in the BSP file after compile"},
 		{"-leaktest", "Abort if a leak was found"},
diff --git a/tools/quake3/q3map2/q3map2.h b/tools/quake3/q3map2/q3map2.h
index 79fbe208..694413ea 100644
--- a/tools/quake3/q3map2/q3map2.h
+++ b/tools/quake3/q3map2/q3map2.h
@@ -1768,6 +1768,7 @@ inline float clipDepthGlobal = 2.0f;
 inline int metaAdequateScore = -1;
 inline int metaGoodScore = -1;
 inline bool g_noob;
+inline int g_globalSurfaceFlags;
 inline String64 globalCelShader;
 inline bool keepLights;
 inline bool keepModels;
diff --git a/tools/quake3/q3map2/shaders.cpp b/tools/quake3/q3map2/shaders.cpp
index 25c8cc09..928810be 100644
--- a/tools/quake3/q3map2/shaders.cpp
+++ b/tools/quake3/q3map2/shaders.cpp
@@ -646,6 +646,7 @@ static void FinishShader( shaderInfo_t *si ){
 	if( g_noob && !( si->compileFlags & C_OB ) ){
 		ApplySurfaceParm( "noob", nullptr, &si->surfaceFlags, nullptr );
 	}
+	si->surfaceFlags |= g_globalSurfaceFlags;
 
 	/* set to finished */
 	si->finished = true;