diff --git a/doc/developer-notes.md b/doc/developer-notes.md
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -107,6 +107,23 @@
 A full list of comment syntaxes picked up by doxygen can be found at http://www.stack.nl/~dimitri/doxygen/manual/docblocks.html,
 but if possible use one of the above styles.
 
+Running & debugging tests
+-------------
+
+Unit tests are run via `make check`
+For running functional tests, see `/test/README.md`
+
+Debugging unit tests can be achieved with GDB.  Simple example:
+```
+cd /build/src/test
+gdb test_bitcoin
+break interpreter.cpp:295  # No path is necessary, just the file name and line number
+run
+# GDB hits the breakpoint
+p/x opcode  # print the value of the variable (in this case, opcode) in hex
+c           # continue
+```
+
 Development tips and tricks
 ---------------------------