Add a couple comments

Michael Jeronimo · Michael Jeronimo · commit 94e37164d9a9 · 2018-12-04T15:38:54.000-08:00
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -35,12 +35,16 @@ endif()
 
 set(BEHAVIOR_TREE_LIBRARY ${PROJECT_NAME})
 
+# Update the policy setting to avoid an error when loading the ament_cmake package
+# at the current cmake version level
 cmake_policy(SET CMP0057 NEW)
 find_package(ament_cmake)
 
 if ( ament_cmake_FOUND )
   find_package(ament_cmake_gtest REQUIRED)
 
+  # Not adding -DUSING_ROS since xml_parsing.cpp hasn't been ported to ROS2
+
   message(STATUS "------------------------------------------")
   message(STATUS "BehaviourTree is being built using AMENT.")
   message(STATUS "------------------------------------------")
