GA PILOT DISCOVERS; AFTER THE FACT; THAT THE MINIMUMS HAVE BEEN CHANGED AT LVK BY NOTAM.

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I WAS FLYING AS PIC UNDER THE HOOD AND HAD A SAFETY PLT. I BRIEFED THE APCH WITH A CIRCLE ALT OF 940 FT MSL WHICH IS WHAT IS PUBLISHED ON THE CHART. WE WERE EXECUTING THE ILS RWY 25R APCH WITH A CIRCLE TO LAND ON RWY 7. THE CLOUD BOTTOMS WERE RAGGED AND A RPTED CEILING OF 1700 FT BROKEN AND 800 FT SCATTERED. WE CONTINUE THE APCH. AT 1200 FT MSL; I ASKED THE SAFETY PLT HOW WE WERE DOING. HE REPLIED THAT HE SAW NOTHING. I STARTED TO PREPARE MYSELF FOR A GAR. WE CONTINUED THE APCH AND BROKE OUT AT APPROX 1050 FT MSL. I WAS NOT SURE OF THE EXACT ALT AND I RPTED BREAKING OUT AT 1000 FT MSL TO THE TWR. IT WAS ONLY ON THE POSTFLT DEBRIEF THAT I LEARNED THAT THERE WAS AN FDC NOTAM FOR A CIRCLE TO LAND MINIMUM INCREASING IT FROM 940 FT TO 1060 FT. EARLIER IN THE DAY; I HAD BRIEFED THE STRAIGHT-IN INCREASE IN THE DECISION HT BUT HAD NOT BRIEFED THE INCREASE IN THE CIRCLE TO LAND. I WOULD RECOMMEND BETTER AND MORE USER FRIENDLY FORMATTING IN THE FDC NOTAMS. THE USE OF BOLDING OR PARAGRAPH SPACING FOR EACH TYPE OF APCH THAT HAS AN FDC NOTAM WOULD PREVENT THEM FROM BEING LOST IN THE TEXT. BY MAKING THEM STAND OUT BETTER; THEY ARE LESS LIKELY TO BE MISSED IN FUTURE PREFLT BRIEFS.