Diff of /core/vil/introduction_doxy.txt [c7bc9e] .. [20a6d9] Maximize Restore

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--- a/core/vil/introduction_doxy.txt
+++ b/core/vil/introduction_doxy.txt
@@ -209,6 +209,12 @@
 * - vil_vil1_to_image_resource(vil1_image): creates a vil_image_resource.
 * - vil_vil1_to_image_view(vil1_memory_image_of<T>): creates a vil_image_view<T>.
 * - vil_vil1_from_image_view(vil_image_view<T>): creates a vil1_memory_image_of<T>.
+*
+* \section Error Reporting
+*
+* Currently most error reporting either happens by calling vcl_abort, or by returning
+* a null image. The null images reporting in particular will transition to exception-based
+* reporting. You can retain the old behaiour by setting VXL_LEGACY_ERROR_REPORTING with CMake.
 *
 * \section algo Algorithms and Image Processing
 * Some simple algorithms for manipulating images are included in the algo sub-directory.