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+# Implicit connection of nets with same label
+
+Nets labelled with the same text are now implicitly connected even if there is no physical connection.
+This can be useful to verify subcircuits. For example, a layout cell may use two different power nets which need to be connected on a higher hierarchy level. Without implicit connections it's not possible to verify the layout cell's functionality, because the connectivity extraction will render two power pins.
+
+The implicit connection feature allows putting the same label on those two nets and make the nets
+connected this way. It's not important which layers the nets are on. Only labels on the same hierarchy
+level are considered.
+
+Top-level layouts must not be extracted with this feature. Otherwise, opens may not be detected if both parts of
+the nets are labelled with the same label. Hence, this feature is configurable.
+
+The respective switch is the new "join_nets_by_label" argument of ```LayoutToNetlist#extract_netlist```.
+
+By default, implicit connections are enabled. To disable implicit joining of nets, use
+
+```
+l2n = RBA::LayoutToNetlist::new
+...
+# extract netlists with implicit joining disabled
+l2n.extract_netlist(false)
+```
+
+
+