diff --git a/README.md b/README.md
index 87edf281d..91fd26ba4 100644
--- a/README.md
+++ b/README.md
@@ -575,6 +575,11 @@ with examples:
 
 	genie --with-sdl vs2012
 
+**NOTE** Special care is necessary to make custom windowing to work with
+multithreaded renderer. Each platform has rules about where renderer can be and
+how multithreading interacts with context/device. To disable multithreaded
+render use `BGFX_CONFIG_MULTITHREDED=0` preprocessor define.
+
 Tools
 -----
 
diff --git a/include/bgfxplatform.h b/include/bgfxplatform.h
index 1e073de83..8544e8eec 100755
--- a/include/bgfxplatform.h
+++ b/include/bgfxplatform.h
@@ -163,7 +163,7 @@ namespace bgfx
 #	elif BX_PLATFORM_WINDOWS
 		HWND hwnd = glfwGetWin32Window(_window);
 		winSetHwnd(hwnd);
-#	endif BX_PLATFORM_WINDOWS
+#	endif // BX_PLATFORM_WINDOWS
 	}
 
 } // namespace bgfx
diff --git a/src/renderer_gl.cpp b/src/renderer_gl.cpp
index 777ea7028..e1ed15431 100644
--- a/src/renderer_gl.cpp
+++ b/src/renderer_gl.cpp
@@ -2669,6 +2669,7 @@ namespace bgfx { namespace gl
 			GLENUM(GL_RENDERBUFFER);
 
 			GLENUM(GL_INVALID_ENUM);
+			GLENUM(GL_INVALID_FRAMEBUFFER_OPERATION);
 			GLENUM(GL_INVALID_VALUE);
 			GLENUM(GL_INVALID_OPERATION);
 			GLENUM(GL_OUT_OF_MEMORY);