How to add a freestyle stroke to a specific edge in blender? I am trying to add a black line (freestyle) to a single edge in blender cycles render. I need help !
Go to Edit mode and select the edge, Ctrl + E, choose Mark Freestyle Edge.
Then go to the Render Layers properties tab. Under Freestyle Line Set, set up the Edge Types as in this screenshot:




Don't forget to enable Freestyle under the Render properties tab.