Update README.md

README.md

@@ -51,10 +51,18 @@ Then run sgxwallet using docker-compose
 cd run_sgx_sim; sudo docker-compose up
 ```
 
+Note: you need a machine that supports Intel AVX512 instuction set.  Most modern Intel CPUs support it. To verify you machine supports AVX512, run
+
+
+```
+cat /proc/cpuinfo | grep avx512
+```
+
+
 Note: sgxwallet requires docker-compose for correct operation. You must always use 
 docker-compose and avoid using raw docker tools.
 
-Note: simulation mode is only try try sgxwallet. 
+Note: simulation mode is only to try sgxwallet. 
 In production, you need to run sgxwallet on a server that supports SGX.
 Never run a production sgxserver in simulation mode.