Mention main ways to build RSpecs

creating-profiles.scrbl

@@ -20,8 +20,9 @@ When you create a new profile, you are creating a new
 @seclink["disk-images"]{disk images} that are referenced by that RSpec.  When
 someone uses your profile, they will get their own
 @seclink["experiments"]{experiment} that boots up the resources (virtual or
-physical) described by the RSpec.
-
+physical) described by the RSpec. It is common to create the resource specifification 
+for profiles using a @seclink["jacks"]{GUI} or by writing a
+@seclink["geni-lib"]{python script} rather than dealing with RSpecs directly.
 
 @section[#:tag "creating-from-existing"]{Creating a profile from an existing one}