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-rw-r--r--doc/ext/tutorial.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/ext/tutorial.rst b/doc/ext/tutorial.rst
index c44748d2..4728de24 100644
--- a/doc/ext/tutorial.rst
+++ b/doc/ext/tutorial.rst
@@ -201,7 +201,7 @@ The ``todo`` directive function looks like this::
def run(self):
env = self.state.document.settings.env
- targetid = "todo-%s" % env.index_num
+ targetid = "todo-%d" % env.index_num
env.index_num += 1
targetnode = nodes.target('', '', ids=[targetid])