diff --git a/include/pcmki/pcmki_cluster_queries.h b/include/pcmki/pcmki_cluster_queries.h
index 0a4c21c816..a99766a1b3 100644
--- a/include/pcmki/pcmki_cluster_queries.h
+++ b/include/pcmki/pcmki_cluster_queries.h
@@ -1,16 +1,25 @@
+/*
+ * Copyright 2020-2022 the Pacemaker project contributors
+ *
+ * The version control history for this file may have further details.
+ *
+ * This source code is licensed under the GNU Lesser General Public License
+ * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
+ */
+
 #ifndef PCMK__PCMKI_PCMKI_CLUSTER_QUERIES__H
 #  define PCMK__PCMKI_PCMKI_CLUSTER_QUERIES__H
 
 #include <glib.h>               // gboolean, GMainLoop, etc.
 
 #include <crm/crm.h>
 #include <crm/common/output_internal.h>
 #include <crm/common/ipc_controld.h>
 #include <crm/common/ipc_pacemakerd.h>
 
 int pcmk__controller_status(pcmk__output_t *out, char *dest_node, guint message_timeout_ms);
 int pcmk__designated_controller(pcmk__output_t *out, guint message_timeout_ms);
 int pcmk__pacemakerd_status(pcmk__output_t *out, char *ipc_name, guint message_timeout_ms);
 int pcmk__list_nodes(pcmk__output_t *out, char *node_types, gboolean BASH_EXPORT);
 
 #endif