diff --git a/src/lua-engine.cpp b/src/lua-engine.cpp
index 2026a437..744baa85 100644
--- a/src/lua-engine.cpp
+++ b/src/lua-engine.cpp
@@ -1330,9 +1330,12 @@ static int rom_getfilename(lua_State *L) {
 
 static int rom_gethash(lua_State *L) {
 	const char *type = luaL_checkstring(L, 1);
-	if(!type) lua_pushstring(L, "");
-	else if(!stricmp(type,"md5")) lua_pushstring(L, md5_asciistr(GameInfo->MD5));
-	else lua_pushstring(L, "");
+	MD5DATA md5hash = GameInfo->MD5;
+
+	if      (!type)                    lua_pushstring(L, "");
+	else if (!stricmp(type, "md5"))    lua_pushstring(L, md5_asciistr(md5hash));
+	else if (!stricmp(type, "base64")) lua_pushstring(L, BytesToString(md5hash.data, MD5DATA::size).c_str());
+	else                               lua_pushstring(L, "");
 	return 1;
 }
 
diff --git a/web/help/LuaFunctionsList.html b/web/help/LuaFunctionsList.html
index 5854e01a..3b8ebd55 100644
--- a/web/help/LuaFunctionsList.html
+++ b/web/help/LuaFunctionsList.html
@@ -224,7 +224,7 @@
 <p><span class="rvts37"><br/></span></p>
 <p><span class="rvts63">rom.gethash(string type)</span></p>
 <p><span class="rvts37"><br/></span></p>
-<p><span class="rvts37">Get a hash of the ROM loaded, for verification.  The only currently supported type is "md5".</span></p>
+<p><span class="rvts37">Get a hash of the ROM loaded, for verification. If type is "md5", returns a hex string of the MD5 hash. If type is "base64", returns a base64 string of the MD5 hash, just like the movie romChecksum value.</span></p>
 <p><span class="rvts37"><br/></span></p>
 <p><span class="rvts63">rom.readbyte(int address)</span></p>
 <p><span class="rvts63">rom.readbyteunsigned(int address)</span></p>