diff --git a/README.md b/README.md
index ee281d3..ee3386e 100644
--- a/README.md
+++ b/README.md
@@ -44,4 +44,5 @@
 ### additional resources  
 [Linux syscalls](https://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/)  
 [System V AMD64 ABI](https://refspecs.linuxbase.org/elf/x86_64-abi-0.99.pdf)  
-[Getting arguments](https://github.com/tonyOreglia/argument-counter/wiki/x86-64-Linux-Assembly-Part-1:-Printing-Command-Line-Arguments)  
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+[Getting arguments](https://github.com/tonyOreglia/argument-counter/wiki/x86-64-Linux-Assembly-Part-1:-Printing-Command-Line-Arguments)  
+[x86 and amd64 instruction reference](https://www.felixcloutier.com/x86/)
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