diff --git a/staticlibs/native/bpf_headers/include/bpf/BpfUtils.h b/staticlibs/native/bpf_headers/include/bpf/BpfUtils.h
index 7801c3e..3f06896 100644
--- a/staticlibs/native/bpf_headers/include/bpf/BpfUtils.h
+++ b/staticlibs/native/bpf_headers/include/bpf/BpfUtils.h
@@ -60,6 +60,9 @@
     // This is a temporary hack for network stats map swap on devices running
     // 4.9 kernels. The kernel code of socket release on pf_key socket will
     // explicitly call synchronize_rcu() which is exactly what we need.
+    //
+    // Linux 4.14/4.19/5.4/5.10/5.15 (and 5.18) still have this same behaviour.
+    // see net/key/af_key.c: pfkey_release() -> synchronize_rcu()
     int pfSocket = socket(AF_KEY, SOCK_RAW | SOCK_CLOEXEC, PF_KEY_V2);
 
     if (pfSocket < 0) {