diff --git a/doc/conf.py b/doc/conf.py
index e63c2b0c8..3cde5bf3b 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -56,7 +56,7 @@ latex_logo = '_static/sphinx.png'
 latex_elements = {
     'fontpkg': '\\usepackage{palatino}',
     'passoptionstopackages': '\\PassOptionsToPackage{svgnames}{xcolor}',
-# fix missing index entry due to RTD doing only once pdflatex after makeindex
+    # fix missing index entry due to RTD doing only once pdflatex after makeindex
     'printindex': r'''
 \IfFileExists{\jobname.ind}
              {\footnotesize\raggedright\printindex}