diff --git a/meta/classes/volatiles.bbclass b/meta/classes/volatiles.bbclass
new file mode 100644
index 0000000..f27e598
--- /dev/null
+++ b/meta/classes/volatiles.bbclass
@@ -0,0 +1,11 @@
+# This bbclass is for read-only-rootfs support. All recipes that may tweak their
+# own directories in order to run correctly in a read-only rootfs enviroment
+# should inherit this class and set VOLATILE_DIR, VOLATILE_LINK, VOLATILE_PKGS.
+
+# For each package, the net result is a read-only specific conf file generated
+# and packaged, which has the name of readonly-${VOLATILESPN}.
+
+# All these config files are then parsed by populate-volatile.sh to create proper
+# directories and links.
+
+inherit ${@base_contains('DISTRO_FEATURES','sysvinit','volatiles_sysvinit','',d)}