Update README.md

Author: stefanusayudha

README.md

@@ -249,7 +249,7 @@ So the permission request should be done in 2 steps:
 - You can use java or kotlin, the syntax won't have a lot different, you can contact me for more help.
 
 ## Build AAR Libray
-To build the library just run the `build-library.sh` in the project root directory.
+To build the library just run the `build-library.sh` in the project root directory. The AAR library will be created in folder `build/library/`.
 
 ## Design and Developed by :
 - [Stefanus Ayudha](https://github.com/stefanusayudha)