diff --git a/libc/docs/source_tree_layout.rst b/libc/docs/source_tree_layout.rst
--- a/libc/docs/source_tree_layout.rst
+++ b/libc/docs/source_tree_layout.rst
@@ -59,7 +59,7 @@
 public libraries ``libc.a``, ``libm.a`` etc.
 
 The ``startup`` directory
-------------------------
+-------------------------
 
 This directory contains the implementations of the application startup objects
 like ``crt1.o`` etc.