diff --git a/Cart_Reader/README.md b/Cart_Reader/README.md
index 2bc75b6..273e66b 100644
--- a/Cart_Reader/README.md
+++ b/Cart_Reader/README.md
@@ -2,7 +2,7 @@ This Arduino code is written by a beginner for beginners, therefore I tried to c
 
 Every submodule has it's own setup_XX() function that configures the needed pins and a submenu that lets you choose what you want to do. 
 The code directly addresses the pins via the DDR, PIN and PORT registers.   
-Please also refer to the [pinout Excel sheet](https://github.com/sanni/cartreader/blob/master/pinout.xls).    
+Please also refer to the [pinout Open Office sheet](https://github.com/sanni/cartreader/blob/master/pinout.ods).    
 ```
 void setup_N64_Controller() {  
   // Output a low signal  
@@ -72,4 +72,4 @@ RGB Tools lib: https://github.com/joushx/Arduino-RGB-Tools
 Neopixel lib: https://github.com/adafruit/Adafruit_NeoPixel    
 Rotary Enc lib: https://github.com/mathertel/RotaryEncoder    
 SI5351 lib: https://github.com/etherkit/Si5351Arduino        
-RTC lib: https://github.com/adafruit/RTClib      
\ No newline at end of file
+RTC lib: https://github.com/adafruit/RTClib