recovery(cwm) says rom may flash stock recovery on boot

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http://forums.androidcentral.com – ive nooted my 16gb international s3 for some time, flashed several roms, and used odin once to flash an updated cwm. im currently running hyperlight rom v0.9 XXDLIB. Now whenever my phone starts to lag or slow down, i boot into recovery, wipe the dalvik cache and cache partition. i do that frequently, one time after i did my wipes, after i pressed reboot into recovery, i got a mesage saying rom may flash stock recovery on boot, continue? it doesnt matter if i press yea or no, the phonrle just boots normally.help please? and i have never played with the kernel (HowTos)