diff --git a/README.md b/README.md
index f261932..0f41d3b 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,65 @@ Works well on:
 
 There is also a stub implementation that returns errors on attempt to create a tray menu.
 
+# Setup
+
+Before you can compile `tray`, you'll need to add an environment definition before the line where you include `tray.h`. 
+
+**For Windows:**
+```c
+#include <stdio.h>
+#include <string.h>
+
+#define TRAY_WINAPI 1
+
+#include "tray.h"
+...
+```
+
+**For Linux:**
+```c
+#include <stdio.h>
+#include <string.h>
+
+#define TRAY_APPINDICATOR 1
+
+#include "tray.h"
+...
+```
+
+**For Mac:**
+**For Windows:**
+```c
+#include <stdio.h>
+#include <string.h>
+
+#define TRAY_APPKIT 1
+
+#include "tray.h"
+...
+```
+
+// For Linux:
+//#define TRAY_APPINDICATOR 1
+// For Mac:
+//#define TRAY_APPKIT 1
+
+# Demo
+
+The included example `.c` files can be compiled based on your environment.
+
+For example, to compile and run the program on Windows: 
+
+```shell
+$> gcc example_windows.c [Enter]
+``` 
+
+This will compile and build `a.out`. To run it: 
+
+```
+$> a [Enter]
+```
+
 # Example
 
 ```c
diff --git a/example.c b/example.c
index f2ea24f..c42ffe2 100644
--- a/example.c
+++ b/example.c
@@ -1,6 +1,14 @@
 #include <stdio.h>
 #include <string.h>
 
+#if defined (_WIN32) || defined (_WIN64)
+#define TRAY_WINAPI 1
+#elif defined (__linux__) || defined (linux) || defined (__linux)
+#define TRAY_APPINDICATOR 1
+#elif defined (__APPLE__) || defined (__MACH__)
+#define TRAY_APPKIT 1
+#endif
+
 #include "tray.h"
 
 #if TRAY_APPINDICATOR
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