1 files changed, 3 insertions, 1 deletions
diff --git a/README.md b/README.md
index ee279d0..a564393 100644
--- a/README.md
+++ b/README.md
@@ -25,9 +25,11 @@
 
 ### Installation
 
-No installation is required! Simply copy the `fbgl.h` file into your project directory and include it in your source files.
+No installation is required! Simply copy the `fbgl.h` file into your project directory and include it in your source files,
+while also defining the `FBGL_IMPLEMENTATION` macro in one of your source files.
 
 ```c
+#define FBGL_IMPLEMENTATION
 #include "fbgl.h"
 ```