diff --git a/docs/CommandGuide/llvmc.pod b/docs/CommandGuide/llvmc.pod
index 97445edf412..86a721a6c43 100644
--- a/docs/CommandGuide/llvmc.pod
+++ b/docs/CommandGuide/llvmc.pod
@@ -71,6 +71,11 @@ write files into the directory specified with the I<-o> option. The
 I<--save-temps=cwd> and I<--save-temps> switches are both synonyms for the
 default behaviour.
 
+=item B<--temp-dir> I<directory>
+
+Write temporary files to the specified directory. This option overrides
+I<--save-temps>.
+
 =item B<--help>
 
 Print a summary of command-line options and exit.
diff --git a/tools/llvmc/doc/LLVMC-Reference.rst b/tools/llvmc/doc/LLVMC-Reference.rst
index 4653e0e9d8f..a5c6fc9f061 100644
--- a/tools/llvmc/doc/LLVMC-Reference.rst
+++ b/tools/llvmc/doc/LLVMC-Reference.rst
@@ -97,6 +97,9 @@ configuration libraries:
   the ``-o`` option. The ``--save-temps=cwd`` and ``--save-temps`` switches are
   both synonyms for the default behaviour.
 
+* ``--temp-dir`` - Write temporary files to the specified directory. This option
+  overrides ``--save-temps``.
+
 * ``--check-graph`` - Check the compilation for common errors like mismatched
   output/input language names, multiple default edges and cycles. Because of
   plugins, these checks can't be performed at compile-time. Exit with code zero