diff --git a/Hunting-crashes:-The-ultimate-guide.rest b/Hunting-crashes:-The-ultimate-guide.rest
index 7027209..705075f 100644
--- a/Hunting-crashes:-The-ultimate-guide.rest
+++ b/Hunting-crashes:-The-ultimate-guide.rest
@@ -1,5 +1,12 @@
 Ok, so your nice Nim program crashes under various hard-to-reproduce conditions. What can you do about that?
 
+Generally speaking the most important question when you have a corruption is **what piece of code wrote to this memory location**. This question is answered by *watchpoints*, breakpoints are mostly useless for this. In general I found breakpoints only useful to set *watchpoints* in them.
+
+Classical debugging
+===================
+
+Use ``--debugger:native`` and use GDB or LLDB or Visual Studio for debugging. Note that currently local variables are mangled and a ``0`` is attached to the name. 
+
 Test with different GCs
 =======================
 
@@ -34,6 +41,8 @@ Test different compiler options
    enables assertions in Nim's GC.
 ``-d:nimBurnFree``
    overwrite deallocated memory with 0xff bytes so that "access after free" triggers a segfault.
+``--tlsEmulation:on|off```
+  turn "thread local storage emulation on/off". This is helpful when you do have an issue in a threaded program. As I recently learned, the fact that TLS is cleaned at thread exit is often an overlooked cause for crashes. TLS is *unsafer* than global storage in this respect.
 
 Edit lib/system/mmdisp.nim and gc.nim
 =====================================
@@ -42,3 +51,4 @@ Even more debugging options can be enabled by editing ``lib/system/mmdisp.nim``.
 
 One problem with corruptions is their non-deterministic nature, in particular heap and stack addresses change from run to run. Define ``-d:corruption`` to enable "cell IDs", so that every "cell" (that is every ``ref``/``string``/``seq``) gets a unique ID. It's often interesting to see if the corrupted cell has the same ID from run to run or if it differs. If it differs the bug is non-deterministic. Within the GC ``writeCell`` can be used to output offending cells.
 
+