Wall lenght and dimensions

[MrTorque]

New at this.
I created a 36' wall. 1' thick block walls. Went to put dimensions next to it. The dimensions came out as 37'.
What am I missing on this one or is it a bug?

Thanks
Kevin

[Puybaret]

Walls are measured in thei middle so the length on their sides may depend on whether they are connected to other walls or not.