diff --git a/packages/taler-harness/README.md b/packages/taler-harness/README.md
index cac904f8e..f88024297 100644
--- a/packages/taler-harness/README.md
+++ b/packages/taler-harness/README.md
@@ -3,3 +3,11 @@
 This package implements the `taler-harness` CLI tool.  It contains integration
 tests for GNU Taler and GNU anastasis, as well as various helpers for managing
 deployments of GNU Taler.
+
+## Debugging
+
+To get more actionable stack traces, enable source maps for node:
+
+```
+export NODE_OPTIONS=--enable-source-maps
+```