update the architecture list
diff --git a/README.md b/README.md
index 07ac001..9d3a63b 100644
--- a/README.md
+++ b/README.md
@@ -112,6 +112,8 @@ Bzip3 has been tested on the following architectures:
- ppc64le
- mips
- mips64
+- sparc
+- s390x
## Corpus benchmarks
