Add docs

tests/integration/p2p.go

@@ -144,7 +144,8 @@ type WaitForSync struct {
 	// NodeIDs are the node IDs (indexes) of the nodes to wait for sync on.
 	// If not provided then the action will wait for sync on all nodes.
 	NodeIDs []int
-	// Count is the number of times the event should be received.
+	// Count is the number of times the event should be received by each node.
+	// Default value (zero) is treated as 1, e.g. the event should be received once.
 	Count uint
 }