only generate documentation when necessary

2 files changed, 6 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 06b47da..a77bd3c 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,8 @@ VENV_PY3_CMD=virtualenv-python3.2
 
 BUILD_CMD=./setup.py sdist --formats gztar,zip bdist_wininst --plat-name win32
 
+DOC_FILES = docs/conf.py $(wildcard docs/*.rst)
+
 # ============================================================================
 
 build:
@@ -28,7 +30,9 @@ upload_doc: doc
 
 # ============================================================================
 
-doc: smartypants_command.py
+doc: docs/_build/html
+
+docs/_build/html: $(DOC_FILES) smartypants.py smartypants_command.py
 	make -C docs html
 
 smartypants_command.py: smartypants
diff --git a/README.rst b/README.rst
index d1bb24d..f656c01 100644
--- a/README.rst
+++ b/README.rst
@@ -44,6 +44,6 @@ Both produce::
 More information
 ----------------
 
-You can read smartypants' documentation_ or  visit smartypants_ on Bitbucket.
+You can read smartypants' documentation_ or visit smartypants_ on Bitbucket.
 
 .. _documentation: http://pythonhosted.org/smartypants/