docs: Fix Sphinx toctree warning.

llvm-svn: 167905

diff --git a/llvm/docs/subsystems.rst b/llvm/docs/subsystems.rst
index 80d0eed..1c4fd23 100644 (file)
--- a/llvm/docs/subsystems.rst
+++ b/llvm/docs/subsystems.rst
@@ -18,6 +18,10 @@ Subsystem Documentation
    DebuggingJITedCode
    GoldPlugin
    MarkedUpDisassembly
+   HowToUseInstrMappings
+
+.. FIXME: once LangRef is Sphinxified, HowToUseInstrMappings should be put
+   under LangRef's toctree instead of this page's toctree.
 
 * `Writing an LLVM Pass <WritingAnLLVMPass.html>`_