diff --git a/doc/Makefile b/doc/Makefile
new file mode 100644
index 0000000..7714bd5
--- /dev/null
+++ b/doc/Makefile
@@ -0,0 +1,11 @@
+
+all: html
+
+html:
+	@echo ----------------
+	@echo Generating epydoc html code documentation.
+	@echo See epydoc-html.log for epydoc log.
+	@echo ----------------
+	epydoc --html -o html/ ../fluents ../workflows 2> epydoc-html.log
+
+
diff --git a/fluents/dataset.py b/fluents/dataset.py
index ad6a617..3bd513e 100644
--- a/fluents/dataset.py
+++ b/fluents/dataset.py
@@ -208,7 +208,7 @@ class CategoryDataset(Dataset):
 
     Always has linked dimension in first dim:
     ex matrix:
-             go_term1    go_term2  ...
+    .        go_term1    go_term2  ...
     gene_1
     gene_2
     gene_3