diff --git a/aos/configuration.h b/aos/configuration.h
index 5579334..7383a1a 100644
--- a/aos/configuration.h
+++ b/aos/configuration.h
@@ -96,6 +96,11 @@
 // in a single node world.)
 std::vector<const Node *> GetNodes(const Configuration *config);
 
+// Returns a vector of the nodes in the config with the provided tag.  If this
+// is a single-node world, we assume that all tags match.
+std::vector<const Node *> GetNodesWithTag(const Configuration *config,
+                                          std::string_view tag);
+
 // Returns the node index for a node.  Note: will be faster if node is a pointer
 // to a node in config, but is not required.
 int GetNodeIndex(const Configuration *config, const Node *node);