diff --git a/_static/custom.css b/_static/custom.css
index d930e9b..d1f0a32 100644
--- a/_static/custom.css
+++ b/_static/custom.css
@@ -9,3 +9,7 @@ body > .container-xl {
 .navbar-syllabus .dropdown {
   position: unset;
 }
+
+.toctree-wrapper *:not(.figure) > .caption {
+  display: none;
+}
diff --git a/index.rst b/index.rst
index 6c31560..0a0ff4a 100644
--- a/index.rst
+++ b/index.rst
@@ -43,6 +43,7 @@ Part 1: Principles
 
 .. toctree::
    :maxdepth: 4
+   :caption: Part 1: Principles
 
    principles/reliability
    principles/network
@@ -60,6 +61,7 @@ Part 2: Protocols
 
 .. toctree::
    :maxdepth: 4
+   :caption: Part 2: Protocols
 
    protocols/transport-service
    protocols/dns
@@ -88,6 +90,7 @@ Part 3: Practice
 
 .. toctree::
    :maxdepth: 4
+   :caption: Part 3: Practice
 
    exercises/intro
    exercises/reliability
@@ -165,6 +168,7 @@ Appendices
 
 .. toctree::
    :maxdepth: 4
+   :caption: Appendices
 
    glossary
    bibliography