mention used code style

PiperOrigin-RevId: 553095898
diff --git a/ b/
index a00e37d..b34ee15 100644
--- a/
+++ b/
@@ -21,6 +21,11 @@
 All submissions, including submissions by project members, require review. We
 use Github pull requests for this purpose.
+### Code style
+Code should follow applicable formatting and style guides described in
+[Google Style Guides]( C code should be
+C89 compatible.
 ### The small print
 Contributions made by corporations are covered by a different agreement than
 the one above, the [Software Grant and Corporate Contributor License Agreement]