diff --git a/cran-comments.md b/cran-comments.md
index c64f0b1a1050fa3ce04a2d3e7ee2c740932edc07..47c091e786369a72d3f15adab1dbbe240718acc9 100644
--- a/cran-comments.md
+++ b/cran-comments.md
@@ -1,6 +1,7 @@
 ## Test environments
 * Linux luzs 4.4.0-64-generic, R version 3.2.3
 * i386-w64-mingw32 (32-bit), R version 3.3.3
+* x86_64-w64-mingw32 (64-bit) R version 3.4.0 beta
 
 ## R CMD check results
 There were no ERRORs or WARNINGs.