I guess the comment in the parenthesis with "via find_package" is a bit unclear for new users.

Can you update this block to mention both things separately:
* in the package.xml
  * built_depend on *message_generation*
  * run_depend on *message_runtime*
* in this CMakeLists.txt
  * add *message_generation* component to `find_package(catkin REQUIRED COMPONENTS ...)`
  * add *message_runtime* to `catkin_package(CATKIN_DEPENDS ...)`