Updated README.

README.md

@@ -455,8 +455,8 @@ Amalgamated build
 
 For ease of integration to other build system bgfx library can be built with
 single .cpp file. It's only necessary to build [src/amalgamated.cpp](https://github.com/bkaradzic/bgfx/blob/master/src/amalgamated.cpp)
-or on OSX/iOS [src/amalgamated.mm](https://github.com/bkaradzic/bgfx/blob/master/src/amalgamated.mm)
+(for OSX/iOS use [src/amalgamated.mm](https://github.com/bkaradzic/bgfx/blob/master/src/amalgamated.mm)
-inside different build system.
+instead) inside different build system.
 
 OculusVR integration
 --------------------