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-rw-r--r--docs/users_guide/runtime_control.xml9
1 files changed, 9 insertions, 0 deletions
diff --git a/docs/users_guide/runtime_control.xml b/docs/users_guide/runtime_control.xml
index 14732c57c3..d35027b73d 100644
--- a/docs/users_guide/runtime_control.xml
+++ b/docs/users_guide/runtime_control.xml
@@ -130,6 +130,15 @@
things like ctrl-C. This option is primarily useful for when
you are using the Haskell code as a DLL, and want to set your
own signal handlers.</para>
+
+ <para>Note that even
+ with <option>--install-signal-handlers=no</option>, the RTS
+ interval timer signal is still enabled. The timer signal
+ is either SIGVTALRM or SIGALRM, depending on the RTS
+ configuration and OS capabilities. To disable the timer
+ signal, use the <literal>-V0</literal> RTS option (see
+ above).
+ </para>
</listitem>
</varlistentry>