diff --git a/rcl/Doxyfile b/rcl/Doxyfile
index a0e5efe..d58f95b 100644
--- a/rcl/Doxyfile
+++ b/rcl/Doxyfile
@@ -23,5 +23,6 @@ PREDEFINED             += RCL_WARN_UNUSED=
 TAGFILES += "../../../../doxygen_tag_files/cppreference-doxygen-web.tag.xml=http://en.cppreference.com/w/"
 # Consider changing "latest" to the version you want to reference (e.g. beta1 or 1.0.0)
 TAGFILES += "../../../../doxygen_tag_files/rmw.tag=http://docs.ros2.org/latest/api/rmw/"
+TAGFILES += "../../../../doxygen_tag_files/rcutils.tag=http://docs.ros2.org/latest/api/rcutils/"
 # Uncomment to generate tag files for cross-project linking.
 #GENERATE_TAGFILE = "../../../../doxygen_tag_files/rcl.tag"
diff --git a/rcl/include/rcl/graph.h b/rcl/include/rcl/graph.h
index 3b39d4e..0970487 100644
--- a/rcl/include/rcl/graph.h
+++ b/rcl/include/rcl/graph.h
@@ -190,6 +190,7 @@ rcl_names_and_types_fini(rcl_names_and_types_t * names_and_types);
  * <i>[1] implementation may need to protect the data structure with a lock</i>
  *
  * \param[in] node the handle to the node being used to query the ROS graph
+ * \param[in] allocator used to control allocation and deallocation of names
  * \param[out] node_names struct storing discovered node names.
  * \return `RCL_RET_OK` if the query was successful, or
  * \return `RCL_RET_ERROR` if an unspecified error occurs.
diff --git a/rcl/include/rcl/rcl.h b/rcl/include/rcl/rcl.h
index a7cb841..cf8bb94 100644
--- a/rcl/include/rcl/rcl.h
+++ b/rcl/include/rcl/rcl.h
@@ -29,6 +29,15 @@
  * - Timer
  *   - rcl/timer.h
  *
+ * There are some functions for working with "Topics" and "Services":
+ *
+ * - A function to validate a topic or service name (not necessarily fully qualified):
+ *   - rcl_validate_topic_name()
+ *   - rcl/validate_topic_name.h
+ * - A function to expand a topic or service name to a fully qualified name:
+ *   - rcl_expand_topic_name()
+ *   - rcl/expand_topic_name.h
+ *
  * It also has some machinery that is necessary to wait on and act on these concepts:
  *
  * - Initialization and shutdown management (global for now)