adding a comment on scroll meta-annotations

source/Scrolls/README.md

@@ -33,6 +33,9 @@ theory Midpoint =
                  to have access to the facts formalized in the problem theory ❙
         include ?Midpoint/Problem ❙
 
+        // the next meta annotations (to the theory) actually make this theory into a scroll: 
+           We specify the Problem and Solution theories  ❙
+
         meta ?MetaAnnotations?label "MidPoint" ❙
         meta ?MetaAnnotations?problemTheory ?Midpoint/Problem ❙
         meta ?MetaAnnotations?solutionTheory ?Midpoint/Solution ❙
@@ -58,4 +61,4 @@ theory Midpoint =
         ❙
     ❚
 ❚
-```
\ No newline at end of file
+```