diff --git a/README.md b/README.md
index cf9ecbf..9a8af78 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@ T Ge, CY Chen, Y Ni, YCA Feng, JW Smoller. Polygenic Prediction via Bayesian Reg
 
 ## Recent Version History
 
+**Jun 4, 2021**: Expanded reference panels to five populations.
+
 **May 26, 2021**: Added suggestions for limiting the number of threads in scipy when running PRS-CS (see Computational Efficiency section below).
 
 **Apr 6, 2021**: Added projection of the LD matrix to its nearest non-negative definite matrix.