diff --git a/docs/core/usage.qmd b/docs/core/usage.qmd
index df5fa605c..9ba74e271 100644
--- a/docs/core/usage.qmd
+++ b/docs/core/usage.qmd
@@ -514,7 +514,8 @@ min_level     | Float64  | $m$          | -
 
 # LevelDemand {#sec-level_demand}
 
-A `LevelDemand` node associates a minimum and a maximum level with connected basins to be used by the allocation algorithm.
+A `LevelDemand` node associates a minimum and a maximum level with connected Basins to be used by the allocation algorithm.
+Since this connection conveys information rather than flow, an outgoing control edge must be used.
 Below the minimum level the basin has a demand of the supplied priority,
 above the maximum level the basin has a surplus and acts as a source, used by all nodes with demands in order of priority.
 The same `LevelDemand` node can be used for Basins in different subnetworks.