diff --git a/docs/Makefile b/docs/Makefile
index ed88099..d0c3cbf 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -5,7 +5,7 @@
 # from the environment for the first two.
 SPHINXOPTS    ?=
 SPHINXBUILD   ?= sphinx-build
-SOURCEDIR     = .
+SOURCEDIR     = source
 BUILDDIR      = build
 
 # Put it first so that "make" without argument is like "make help".