Add note about why we can skip some license files.

chapters/annotations.tex

@@ -2332,6 +2332,8 @@ \section{License Texts}\label{license-texts}
 If the annotation specifies an array of license files the conditions in all of them must be satisfied (i.e., it is not intended for dual-licensing).
 External functions may also contain this annotation (with similar content), see \cref{annotations-for-external-libraries-and-include-files}.
 When generating a distributable version for a translated model the license files for used functions and top-level classes should be included.
+Exceptions could be that licenses will be distributed in another way, either the same ones -- or there is an agreement to use different licenses (e.g., for internal libraries).
+Note that the collection of license files is only intended as a help, thus there is no need for a strict definition of distributable version or stricter rules for including the license files.
 
 
 \section{Functions}\label{annotations-for-functions}