diff --git a/readme.md b/readme.md
index cebfde4..302b48e 100644
--- a/readme.md
+++ b/readme.md
@@ -1,3 +1,4 @@
+### Usage
 
 1. Prepare & install
     1. ```brew tap osx-cross/avr```
@@ -15,4 +16,9 @@
     1. Install c/c++ extension via marketplace
     2. Download https://git.timovolkmann.de/tvolkmann/avr-vsc-c-demo for sample project. Make sure that paths in ```.vscode/c_cpp_properties.json``` are correct.
     3. Enter project directory and build with ```$ make all``` 
-    4. Flash to Arduino with ```$ make flash```
\ No newline at end of file
+    4. Flash to Arduino with ```$ make flash```
+
+### Helpful resources
+
+- https://github.com/tilaktilak/atmega328P/blob/master/makefile
+- tbd