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+This file contains a list of known but not yet fixed bugs in ngspice.
+===========================================================================
+
+How to submit a bug report:
+
+There are two methods to report a bug you have discovered in ngspice:
+
+    * Bug tracker: This is the preferred method of reporting a bug.
+      Using the tracker on Sourceforge.net site will make your report
+      open by everyone and the chances of finding a fix will increase.
+
+    * ngspice-devel list: If you are a member of this list, you can write
+      directly to the developers' list. Do not subscribe to the list only
+      for sending bug reports.
+
+Before sending a bug report please note: all information you send to the bug
+tracking system or on the mailing lists is public. If you need to send
+sensitive information, send them to a developer directly but still write non
+sensitive data on the bug tracking system to keep track of bug history.
+
+* please refer to the sourceforge bug tracker at
+  http://sourceforge.net/p/ngspice/bugs/
+
+------------------------------------------------------------------------------
+OPEN BUGS:
+------------------------------------------------------------------------------
+* pole-zero analysis
+
+  The pole-zero (.pz) analysis, which still uses the original spice3f5
+  algorithms, does not give correct results for all tested input files.
+  The effort to correct that issue seems to be large.
+
+
+* voltage (and current) controlled switches need better timing
+
+  The controlled switches (SW, CSW), which still stem from the original
+  spice3f5 implementation, sometimes lead to wrong results when on and off
+  ramp times differ considerably.