Update user_guide.md

VUnit · Jun 10, 2015 · 17b533a · 17b533a
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@@ -275,3 +275,6 @@ vu.set_sim_option("vsim_extra_args.gui", "-voptargs=+acc")
   - Extra arguments passed to `vsim` when loading the design.
 * `vsim_extra_args.gui`
   - Extra arguments passed to `vsim` when loading the design in GUI mode where it takes precedence over `vsim_extra_args`.
+
+### Ctrl-C when using Git/MSYS Bash on Windows
+VUnit will catch Ctrl-C and perform a clean shutdown closing all started simulation processes and printing the test report so far. On Git/MSYS Bash on Windows however there is a mechanism that hard kills a process a very short time after pressing Ctrl-C often prohibiting VUnit from completing its shutdown. This can leave simulation process open which have to be manually killed. See this [stack overflow post](http://stackoverflow.com/questions/23678045/control-c-kills-ipython-in-git-bash-on-windows-7) for tips on how to remove this mechanism.