diff --git a/docs/modules/0_getting_started/3_how_to_contribute_main.rst b/docs/modules/0_getting_started/3_how_to_contribute_main.rst
index 296e4e8658..6e5c1be8ee 100644
--- a/docs/modules/0_getting_started/3_how_to_contribute_main.rst
+++ b/docs/modules/0_getting_started/3_how_to_contribute_main.rst
@@ -1,4 +1,4 @@
-How To Contribute
+How to contribute
 =================
 
 This document describes how to contribute this project.
diff --git a/docs/modules/0_getting_started/4_how_to_read_textbook_main.rst b/docs/modules/0_getting_started/4_how_to_read_textbook_main.rst
index fb8db348c6..1625c838af 100644
--- a/docs/modules/0_getting_started/4_how_to_read_textbook_main.rst
+++ b/docs/modules/0_getting_started/4_how_to_read_textbook_main.rst
@@ -3,4 +3,12 @@
 How to read this textbook
 --------------------------
 
-TBD
\ No newline at end of file
+This document is structured to help you learn the fundamental concepts
+behind each sample code in PythonRobotics.
+
+If you already have some knowledge of robotics technologies, you can start
+by reading any document that interests you.
+
+However, if you have no prior knowledge of robotics technologies, it is
+recommended that you first read the :ref:`Introduction` section and then proceed
+to the documents related to the technical fields that interest you.
\ No newline at end of file
diff --git a/docs/modules/1_introduction/introduction_main.rst b/docs/modules/1_introduction/introduction_main.rst
index 4561efd349..ec1f237545 100644
--- a/docs/modules/1_introduction/introduction_main.rst
+++ b/docs/modules/1_introduction/introduction_main.rst
@@ -1,4 +1,4 @@
-.. _introduction:
+.. _Introduction:
 
 Introduction
 ============