MECHANIC IS INFORMED HE FAILED TO MAKE A LOGBOOK ENTRY AFTER COMPLETING A SPECIAL CHECK OF A GROUND SPOILER ROD END BOLT POSITION INSTALLATION ON A B737-300.

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MAINT RECEIVED A PHONE CALL AND A FAX PERTAINING TO ACFT FOR CHK ITEM TO BE COMPLIED WITH PRIOR TO FURTHER FLT DURING THE ACFT'S VISIT TO ZZZ (THROUGH-FLT). I THEN PROCEEDED TO COMPLY WITH THE CHK ITEM AFTER THE ACFT ARRIVED; AND FOLLOWED THE PAPERWORK THAT WAS ASSIGNED TO ME. UPON COMPLETION OF THE CHKLIST; I SIGNED OFF THE CHK ITEM AND THE COVER SHEET; HOWEVER; I INADVERTENTLY FAILED TO MAKE A LOGBOOK ENTRY. I HAD ASSUMED THAT THE COVER SHEET AND SIGNED CHK ITEM SATISFIED THE REQUIRED PAPERWORK. I HAVE SINCE JUST LEARNED THAT THIS CHK ITEM REQUIRES A LOGBOOK ENTRY IF IT IS ISSUED DURING A THROUGH-FLT PER THE PROCS MANUAL. I HAVE REVIEWED THESE PROCS IN AN EFFORT TO AVOID ANY FUTURE CONFUSION. THIS RPT WAS FILED IMMEDIATELY UPON DISCOVERY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THEIR NORMAL PROCEDURE IS TO SIGNOFF THE COMPLETION SHEET FOR ANY WORK SPECIFICALLY CALLED OUT TO BE PERFORMED. WHENEVER A LOGBOOK ENTRY IS ALSO REQUIRED; AN ADDITIONAL SIGN OFF BLOCK IS ADDED; MAKING NOTE OF THE REQUIREMENT FOR A LOGBOOK ENTRY. THAT ADDED MAINT NOTE WAS NOT ON THEIR CLOSEOUT SHEET.