The tools
Pen
Freehand. Circle the thing you’re asking about.
Highlighter
Draw attention without covering the linework underneath.
Box
A clean rectangle around an area — reads better than a scribble when it’s going out to the GC.
Measure
Distance on the sheet. Needs to be calibrated first or the numbers are meaningless.
Before you trust the measure tool
Who sees your markup
Next
Attach it to an RFI
A marked-up sheet is the fastest way to get an RFI answered.
Revisions
Superseded, not deleted.