xref to the docs for +RTS -xc

diff --git a/docs/users_guide/ghci.xml b/docs/users_guide/ghci.xml
index d8d0a89..0f78ebe 100644 (file)
--- a/docs/users_guide/ghci.xml
+++ b/docs/users_guide/ghci.xml
@@ -1373,7 +1373,9 @@ a :: a
         have no context information attached to them.  Finding which
         particular call to <literal>head</literal> in your program resulted in
         the error can be a painstaking process, usually involving
-        <literal>Debug.Trace.trace</literal>.</para>
+        <literal>Debug.Trace.trace</literal>, or compiling with
+        profiling and using <literal>+RTS -xc</literal> (see <xref
+          linkend="prof-time-options" />).</para>
 
       <para>The GHCi debugger offers a way to hopefully shed some light on
         these errors quickly and without modifying or recompiling the source