On the new Player's Aid Card, there's a note below the Roll/Result portion of E2:
* Close Range (before firing) Detection occurs on roll of
10 or higher (apply first two modifers below only)
The first two modifiers are the year modifier and KC+O+S and are grouped with a brace labelled "Close". It's similar to how E3 had the Escort and Air braces added in a previous version to delimit what modifiers apply to the attack damage rolls of successful escort or air attacks.
There is also the following modifier:
+1 Close Range (after firing)
Is that the only info you were looking for or are you also wanting an opinion on how clear it is? I felt like things were clarified well here on the forums, but IMHO, the notes and brace make the Close (before firing) and Close (after firing) modifiers clear. Obviously YMMV.