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-rw-r--r--HACKING6
1 files changed, 4 insertions, 2 deletions
diff --git a/HACKING b/HACKING
index f914885d..9bece404 100644
--- a/HACKING
+++ b/HACKING
@@ -718,5 +718,7 @@ Do a
then rebuild. If this is enabled, txr uses the Valgrind API to inform valgrind
about the state of allocated or unallocated areas on the garbage collected
-heap. Valgrind will be able to trap uses of objects which are marked
-as garbage.
+heap, if it is run with the --vg-debug option. Valgrind will be able to trap
+uses of objects which are marked as garbage. Using --gc-debug together
+with --vg-debug while running txr under valgrind is a pretty good way to catch
+gc-related errors.