- "Insert STRING on each line of the rectangle with corners at point and mark
-(START and END when called from a program), shifting text right. The left edge
-of the rectangle specifies the column for insertion. This command does not
-delete or overwrite any existing text."
- (interactive "r\nsString rectangle: ")
+ "Insert STRING on each line of the region-rectangle, shifting text right.
+The left edge of the rectangle specifies the column for insertion. This
+command does not delete or overwrite any existing text.
+
+When called from a program, the rectangle's corners are START and END."
+ (interactive "*r\nsString rectangle: ")