diff --git a/internal/querynode/flow_graph_node.go b/internal/querynode/flow_graph_node.go
index fcd63d7732..d34fa4d059 100644
--- a/internal/querynode/flow_graph_node.go
+++ b/internal/querynode/flow_graph_node.go
@@ -23,4 +23,6 @@ type baseNode = flowgraph.BaseNode
 
 // node is type flowgraph.Node
 type node = flowgraph.Node
+
+// inputNode is type flowgraph.InputNode
 type inputNode = flowgraph.InputNode