diff --git a/Makefile b/Makefile
index 5a57151..f4ca23a 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ help:
 %: Makefile
 	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
+# make sphinx support chinese with xelatex
 xelatexpdf: Makefile latex
 	@echo "Runnning LaTeX files through xelatex..."
 	cd $(BUILDDIR)/latex; latexmk -xelatex -shell-escape -interaction=nonstopmode
diff --git a/README.rst b/README.rst
index b50f0fa..b44a865 100644
--- a/README.rst
+++ b/README.rst
@@ -33,7 +33,7 @@
    $ make html
    $ firefox build/html/index.html&
 
-#. 编译生成PDF（要求安装TeXLive 2015）::
+#. 编译生成PDF（要求安装TeXLive 2016）::
 
    $ make xelatexpdf
    $ evince build/latex/Makefile.pdf&
@@ -41,7 +41,7 @@
 sphinx中文支持
 --------------
 
-sphinx和readthedocs网站默认是不支持中文的，因为对 ``conf.py`` 和 ``Makefile`` 做了些许修改。详情参考 `sphinx生成中文PDF <http://seisman.info/chinese-support-for-sphinx.html>`_ 或 `Commit 35288db <https://github.com/seisman/how-to-write-makefile/commit/35288dbcd859abf5107dd6900dca25f0d1b44db7>`_
+sphinx和readthedocs网站默认是不支持中文的，因为对 ``conf.py`` 和 ``Makefile`` 做了些许修改。详情参考 `sphinx生成中文PDF <http://seisman.info/chinese-support-for-sphinx.html>`_ 以及本项目中的 ``conf.py`` 和 ``Makefile`` 源码。
 
 .. _`陈皓`: http://coolshell.cn/haoel
 .. _`Andriki`: http://andriki.com/mediawiki/index.php?title=Linux:%E8%B7%9F%E6%88%91%E4%B8%80%E8%B5%B7%E5%86%99Makefile