A CARGO PILOT NOTES THAT THE DEN AIRPORT DIAGRAM CONSTRAINT FOR AIRCRAFT TURNING AT TAXIWAYS M AND M2 IS MISLEADING AND ONLY APPLIES TO AIRCRAFT EXITING RWY 17R/35L ON M2.

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AFTER LNDG ON DEN RWY 35L WE EXITED THE RWY ON TXWY M6. TWR CLRED US TO TAXI 'M; SC; TO THE RAMP WITH ME; CONTACT CITY RAMP ON SC.' CAPT MANEUVERED THE ACFT TO JOIN TXWY M AND TAXI SBOUND. I COMPLETED THE AFTER LNDG CHKLIST AND CONTACTED THE CARGO RAMP AS REQUESTED DURING THE IN-RANGE CALL. AFTER COMPLETING THE CALL I AGAIN REVIEWED THE ARPT DIAGRAM TO ENSURE WE WERE FOLLOWING OUR TAXI INSTRUCTIONS. IT WAS DURING THIS REVIEW THAT I NOTICED THE NOTE 'THERE IS INSUFFICIENT TWY CORNER FILLET PAVEMENT IN THE SE CORNER OF TXWYS M AND M2 INTXN FOR ACFT WITH WINGSPAN OVER 107 FT.' I MENTIONED THE NOTE TO THE CAPT; BY THIS TIME WE WERE APCHING TXWY EA WHICH IS THE LAST AVAILABLE TURNOFF PRIOR TO THE INTXN MENTIONED IN THE NOTE ABOVE. I TRIED TO CONTACT THE TWR AS THE CAPT SLOWED THE ACFT. MY FIRST XMISSION WENT OUT OVER THE RAMP FREQ; AS I HAD NOT SWITCHED BACK TO VHF 1 AFTER I HAD MADE THE ON DECK CALL. AFTER I REALIZED MY MISTAKE I SWITCHED BACK TO RADIO #1 AND ASKED THE TWR ABOUT THE NOTE. THEY DIDN'T KNOW WHAT WE WERE TALKING ABOUT AND ASKED WHERE WE HAD GOTTEN OUR INFO. I REPLIED THAT THE NOTE WAS ON OUR GND CHART. TWR EXPLAINED TO US THAT THE NOTE ONLY APPLIED TO ACFT EXITING RWY 35L ON M2 AND THEN TURNING SBOUND ON TXWY M (THIS INFO IS NOT LISTED ON THE ARPT DIAGRAM). DURING THIS CONVERSATION WE HAD BEGUN TO MANEUVER THE ACFT ONTO TXWY EA TO MEET THE CLRNC WE 'EXPECTED' TO RECEIVE FROM TWR. THE TWR THEN XMITTED 'NEXT TIME CHK WITH ME BEFORE YOU DEVIATE FROM YOUR CLRED TAXI RTE.' UH OH. IT CERTAINLY WAS NEVER OUR INTENTION TO DEVIATE FROM THE CORRECT TAXI ROUTING. EVEN WITH THE BEST OF INTENTIONS WE FOUND OURSELVES IN THIS PREDICAMENT. LESSONS LEARNED: 1) WHEN YOU WORK FLYING FREIGHT FATIGUE IS ALWAYS A FACTOR. IT WAS THE LAST PORTION OF OUR FIRST NIGHT OF A WEEK OF HUB TURNS. EARLY AM LCL. WE WERE SAFE. WE WERE LEGAL. WE WERE TIRED. 2) IF IN DOUBT ABOUT TAXI INSTRUCTIONS SAY THE WORD 'STOP.' SUGGESTION: 1) THE NOTE ON THE COMMERCIAL CHART IS CONFUSING. THE NOTE SHOULD BE DELETED OR CORRECTED TO REFLECT ATC'S INTENTIONS.