diff --git a/docs/Complete_list_of_command_line_parameters.htm b/docs/Complete_list_of_command_line_parameters.htm
index 960c785b..afbfcae9 100644
--- a/docs/Complete_list_of_command_line_parameters.htm
+++ b/docs/Complete_list_of_command_line_parameters.htm
@@ -108,7 +108,8 @@ td.formatted_questions ol { margin-top: 0px; margin-bottom: 0px; }
 	<li><strong><code>-connect</code> address:</strong> Talk to a NetRadiant instance using a specific XML based protocol</li>
 		<li><strong><code>-force</code>:</strong> Allow reading some broken/unsupported BSP files e.g. when decompiling, may also crash</li>
 		<li><strong><code>-fs_basepath</code> path:</strong> Sets the given path as main directory of the game (can be used more than once to look in multiple paths)</li>
-		<li><strong><code>-fs_game</code> gamename:</strong> Sets a different game directory name (default for Q3A: baseq3)</li>
+		<li><strong><code>-fs_game</code> gamename:</strong> Sets extra game directory name to additionally load mod's resources from at higher priority (by default for Q3A 'baseq3' is loaded, -fs_game cpma will also load 'cpma'; can be used more than once)</li>
+		<li><strong><code>-fs_basegame</code> gamename:</strong> Overrides default game directory name (e.g. Q3A uses 'baseq3', OpenArena 'baseoa', so -game quake3 -fs_basegame baseoa for OA )</li>
 		<li><strong><code>-fs_homebase</code> dir:</strong> Specifies where the user home directory name is on Linux (default for Q3A: .q3a)</li>
 		<li><strong><code>-game</code> gamename:</strong> Load settings for the given game (default: quake3)</li>
 		<li><strong><code>-subdivisions</code> F:</strong> multiplier for patch subdivisions quality</li>
diff --git a/tools/quake3/q3map2/help.cpp b/tools/quake3/q3map2/help.cpp
index cd3a63ed..b0f03665 100644
--- a/tools/quake3/q3map2/help.cpp
+++ b/tools/quake3/q3map2/help.cpp
@@ -385,7 +385,8 @@ void HelpCommon()
 		{"-force", "Allow reading some broken/unsupported BSP files e.g. when decompiling, may also crash"},
 		{"-fs_basepath <path>", "Sets the given path as main directory of the game (can be used more than once to look in multiple paths)"},
 		{"-fs_forbiddenpath <pattern>", "Pattern to ignore directories, pk3, and pk3dir; example pak?.pk3 (can be used more than once to look for multiple patterns)"},
-		{"-fs_game <gamename>", "Sets a different game directory name (default for Q3A: baseq3, can be used more than once)"},
+		{"-fs_game <gamename>", "Sets extra game directory name to additionally load mod's resources from at higher priority (by default for Q3A 'baseq3' is loaded, -fs_game cpma will also load 'cpma'; can be used more than once)"},
+		{"-fs_basegame <gamename>", "Overrides default game directory name (e.g. Q3A uses 'baseq3', OpenArena 'baseoa', so -game quake3 -fs_basegame baseoa for OA )"},
 		{"-fs_home <dir>", "Specifies where the user home directory is on Linux"},
 		{"-fs_homebase <dir>", "Specifies game home directory relative to user home directory on Linux (default for Q3A: .q3a)"},
 		{"-fs_homepath <path>", "Sets the given path as the game home directory name (fs_home + fs_homebase)"},
diff --git a/tools/quake3/q3map2/path_init.cpp b/tools/quake3/q3map2/path_init.cpp
index 2d5567fd..871f9f45 100644
--- a/tools/quake3/q3map2/path_init.cpp
+++ b/tools/quake3/q3map2/path_init.cpp
@@ -359,6 +359,7 @@ void AddPakPath( char *path ){
 void InitPaths( int *argc, char **argv ){
 	int i, j, k;
 	char temp[ MAX_OS_PATH ];
+	const char *baseGame = nullptr;
 
 
 	/* note it */
@@ -425,6 +426,16 @@ void InitPaths( int *argc, char **argv ){
 			argv[ i ] = NULL;
 		}
 
+		/* -fs_basegame */
+		else if ( striEqual( argv[ i ], "-fs_basegame" ) ) {
+			if ( ++i >= *argc || !argv[ i ] ) {
+				Error( "Out of arguments: No path specified after %s.", argv[ i - 1 ] );
+			}
+			argv[ i - 1 ] = NULL;
+			baseGame = argv[ i ];
+			argv[ i ] = NULL;
+		}
+
 		/* -fs_home */
 		else if ( striEqual( argv[ i ], "-fs_home" ) ) {
 			if ( ++i >= *argc || !argv[ i ] ) {
@@ -481,7 +492,7 @@ void InitPaths( int *argc, char **argv ){
 	*argc = k;
 
 	/* add standard game path */
-	AddGamePath( g_game->gamePath );
+	AddGamePath( baseGame == nullptr? g_game->gamePath : baseGame );
 
 	/* if there is no base path set, figure it out */
 	if ( numBasePaths == 0 ) {