diff --git a/Dev.md b/Dev.md
index f70b67e..1276f53 100644
--- a/Dev.md
+++ b/Dev.md
@@ -48,6 +48,9 @@ Views into the process of Tahoe-LAFS hackery.
  * [How to submit patches](Patches)
  * [coding standards](CodingStandards)
  * [How to write tests](HowToWriteTests)
+ * Debugging:
+  * Debugging tips in tahoe-dev mailing list: <https://tahoe-lafs.org/pipermail/tahoe-dev/2013-April/008165.html>
+  * The [logging system](https://tahoe-lafs.org/trac/tahoe-lafs/browser/trunk/docs/logging.rst)
 
 ### Cool New Ideas We're Working On
  * [Ostrom](Ostrom) is about how social networking and economics interact with distributed storage
@@ -61,7 +64,6 @@ Views into the process of Tahoe-LAFS hackery.
 ## Tools
  * [//cgi-bin/mailman/listinfo/tahoe-lafs-trac-stream tahoe-lafs-trac-stream] mailing list is the way to receive lots of emails from trac
  * Sources for Tahoe-LAFS and its side-projects are browsable via the "Browse Source" button at the top of each [//trac project site]
- * there is an experimental git mirror of the darcs repository (not necessarily up-to-date) [on github](http://github.com/warner/tahoe-lafs).
  * [//source/tahoe-lafs/tarballs/ <https://source/tahoe-lafs/tarballs>] contains snapshots of current source code.
  * The Buildbot page (linked at the top of each page) shows current build and test results.  See the [BuildbotPolicy](BuildbotPolicy) page and [HowtoContributeABuildbot](HowtoContributeABuildbot) page.
  * The Timeline (linked at the top of each page) shows changes to the source code, the issue tickets, and the wiki (i.e. this web site).