diff --git a/.gitignore b/.gitignore
index 7e54d62..f2813da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -129,4 +129,6 @@ dmypy.json
 .pyre/
 
 # VSCode configurations
-.vscode/
\ No newline at end of file
+.vscode/
+
+.DS_Store
diff --git a/.gitmodules b/.gitmodules
index 0a7daea..179f373 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "cgranges"]
 	path = cgranges
 	url = https://github.com/lh3/cgranges
+	ignore = dirty
diff --git a/pybedlite/overlap_detector.py b/pybedlite/overlap_detector.py
index 2b57589..03c76a7 100644
--- a/pybedlite/overlap_detector.py
+++ b/pybedlite/overlap_detector.py
@@ -24,7 +24,7 @@
 Examples of Detecting Overlaps
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-. code-block:: python
+.. code-block:: python
 
     >>> from pybedlite.overlap_detector import Interval, OverlapDetector
     >>> detector = OverlapDetector()