readme description about hole breakout

README.md

@@ -109,7 +109,8 @@ about prices.
 December 2017 at above of CLASS 3 quality, $126 per
 board. [PCBWAY](http://www.pcbway.com) produced [ULX3S v1.8 85F](/pic/ulx3sb-v18.jpg) in 
 May 2018 at the edge of CLASS 1 quality acceptance
-(drill randomness and copper layer misaligment, hole breakout about 180°),
+(drill randomness and copper layer
+misaligment, [hole breakout about 180°](/pic/breakout-180deg-c19-angles.png)),
 $134 per board. [PCBWAY](http://www.pcbway.com) is cheap at boards and assembly but charged 
 $40 for FPGA 85F chip which costed about $30 on [Mouser](http://www.mouser.com) at
 that time.