Updated Working for Web (HTML5) (markdown)

Working-for-Web-(HTML5).md

@@ -57,6 +57,8 @@ After the path configuration, just execute the following command:
 
 `make PLATFORM=PLATFORM_WEB -B`
 
+_If you get "emcc: command not found" or a similar error when running `make` but the paths are correct, add `-e` to the end of the make command._
+
 Generated `libraylib.a` is placed in `raylib\src\libraylib.a` directory.
 
 #### Using CMake
@@ -135,6 +137,8 @@ Once `Makefile` has been reviewed, to compile raylib source code, just execute t
 
     make PLATFORM=PLATFORM_WEB -B
 
+_If you get "emcc: command not found" or a similar error when running `make` but the paths are correct, add `-e` to the end of the make command._
+
 _Note that required resources should be embedded into a `.data` file using the compiler parameter `--preload-file filename.ext` or `--preload-file folder` (already configured in the `Makefile` to use `resources` directory)._
 
 Compilation will generate several output files: