diff --git a/doc/string.rst b/doc/format.rst
similarity index 100%
rename from doc/string.rst
rename to doc/format.rst
diff --git a/doc/index.rst b/doc/index.rst
index 307f45f6..462e3e51 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -11,7 +11,7 @@ Contents:
 .. toctree::
    :maxdepth: 2
 
-   string
+   format
 
 Indices and tables
 ==================