diff --git a/README.md b/README.md
index 7b6251e..365acbf 100644
--- a/README.md
+++ b/README.md
@@ -159,6 +159,8 @@ Depending on your system resources you may want to tweak these hyperparameters.
 
 On **Windows**, use `build_msvc.bat` in a Visual Studio Command Prompt to build with msvc, or you can use `make win64` to use mingw compiler toolchain from linux or windows to build the windows target. MSVC build will automatically use openmp and max threads appropriate for your CPU unless you set `OMP_NUM_THREADS` env.
 
+On **Centos 7**, **Amazon Linux 2018** use `rungnu` Makefile target: `make rungnu` or `make runompgnu` to use openmp.
+
 ## ack
 
 I trained the llama2.c storyteller models on a 4X A100 40GB box graciously provided by the excellent [Lambda labs](https://lambdalabs.com/service/gpu-cloud), thank you.