FLT CREW CLRED TO TAXI TO RWY 25 VIA KILO AND RWY 13 AT MKE HOLD SHORT AT APPROPRIATE LOCATION ONLY THANKS TO LCL CTLR INTERVENTION. RPTR FEELS HOLD SHORT LINE LOCATED ON RWY 13 IS INADEQUATELY HIGHLIGHTED ON THE ARPT PAGE.

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WE RECEIVED TAXI INSTRUCTIONS FROM GND CTL AT MKE TO TAXI OUT VIA TXWY K AND RWY 13 TO RWY 25L. THIS WAS AN ORIGINATOR SO AN ICE TEST WAS REQUIRED FOR THE FIRST FLT OF THE DAY. I REVIEWED THE TXWY DIAGRAM TO ENSURE THAT WE WOULD CROSS RWYS 19R&L BEFORE TURNING ONTO RWY 13 ON OUR WAY TO RWY 25L. I HAVE TAKEN OFF FROM RWY 25L NUMEROUS TIMES; HOWEVER; I WAS ALWAYS INSTRUCTED TO TAXI VIA TXWY M; WHICH HAS A VERY CLRLY DEPICTED HOLD SHORT LINE APCHING RWY 25L. TODAY; HOWEVER; WE WENT VIA RWY 13. ONCE WE WERE ON RWY 13; I INSTRUCTED THE FO TO ADVISE TWR THAT WE WOULD NEED TO DO A SYS TEST. HE INSTRUCTED US TO HOLD OUR POS. UP TO THIS POINT; I WAS SCANNING AHEAD ATTEMPTING TO SEE THE TXWY THAT EXITS RWY 13 AND CONNECTS TO RWY 25L. FURTHERMORE; I WAS PREOCCUPIED WITH COMPLETING THE ICE TEST IN A TIMELY MANNER. AFTER TWR INSTRUCTED US TO HOLD OUR POS; WE COMPLETED THE ICE TEST AND WE COMPLETED OUR BEFORE TKOF CHKLIST. THAT'S WHEN I NOTICED THAT WE WERE HOLDING SHORT OF THE RWY 25L HOLD SHORT LINE WHICH IS ACTUALLY ON RWY 13. THIS IS DEPICTED IN THE ARPT DIAGRAM IN A VERY SMALL AND INCONSPICUOUS INSET AT THE BOTTOM R-HAND CORNER OF THE 10-9 CHART. THERE IS NO CORRESPONDING 'HOT SPOT' MARKING FOR THIS HOLD SHORT LINE; HOWEVER; THERE NEEDS TO BE! I ADVISED TWR THAT HAD HE NOT TOLD US TO HOLD OUR POS WHEN WE ASKED TO DO OUR SYS TEST; WE WOULD HAVE CROSSED THIS HOLD SHORT LINE INADVERTENTLY. HE RESPONDED THAT THERE HAVE BEEN PROBS IN THE PAST.