diff --git a/RTCP/IONProc/src/ION_main.cc b/RTCP/IONProc/src/ION_main.cc
index 10c9b8febda8271b41bf569c65b565895a18b243..a3c226f307a60d9037976fcef11e71516682f68b 100644
--- a/RTCP/IONProc/src/ION_main.cc
+++ b/RTCP/IONProc/src/ION_main.cc
@@ -65,6 +65,9 @@ extern "C" {
 
 // if exceptions are not caught, an attempt is made to create a backtrace
 // from the place where the exception is thrown.
+//
+// JD: if exceptions are caught, a backtrace is produced now as well,
+//     plus the actual exception is printed. So that's preferable as a default.
 #define CATCH_EXCEPTIONS