diff --git a/doc/sphinx/user_manual/parameter_documentation/features/continental_plate.md b/doc/sphinx/user_manual/parameter_documentation/features/continental_plate.md
index bfd9907be..bf016282a 100644
--- a/doc/sphinx/user_manual/parameter_documentation/features/continental_plate.md
+++ b/doc/sphinx/user_manual/parameter_documentation/features/continental_plate.md
@@ -1,5 +1,5 @@
 (part:dev_manual:chap:parameter_documentation:sec:features:subsec:continental_plate)=
-Unit tests
+Continental plate
 ==========
 
 ```{todo}
diff --git a/doc/sphinx/user_manual/parameter_documentation/features/fault.md b/doc/sphinx/user_manual/parameter_documentation/features/fault.md
index 268b4264b..17b0a295f 100644
--- a/doc/sphinx/user_manual/parameter_documentation/features/fault.md
+++ b/doc/sphinx/user_manual/parameter_documentation/features/fault.md
@@ -1,5 +1,5 @@
 (part:dev_manual:chap:parameter_documentation:sec:features:subsec:fault)=
-Unit tests
+Fault
 ==========
 
 ```{todo}
diff --git a/doc/sphinx/user_manual/parameter_documentation/features/mantle_layer.md b/doc/sphinx/user_manual/parameter_documentation/features/mantle_layer.md
index 0adf3a049..f79bbd2f6 100644
--- a/doc/sphinx/user_manual/parameter_documentation/features/mantle_layer.md
+++ b/doc/sphinx/user_manual/parameter_documentation/features/mantle_layer.md
@@ -1,5 +1,5 @@
 (part:dev_manual:chap:parameter_documentation:sec:features:subsec:mantle_layer)=
-Unit tests
+Mantle layer
 ==========
 
 ```{todo}
diff --git a/doc/sphinx/user_manual/parameter_documentation/features/oceanic_plate.md b/doc/sphinx/user_manual/parameter_documentation/features/oceanic_plate.md
index e922f821d..83d44b30d 100644
--- a/doc/sphinx/user_manual/parameter_documentation/features/oceanic_plate.md
+++ b/doc/sphinx/user_manual/parameter_documentation/features/oceanic_plate.md
@@ -1,5 +1,5 @@
 (part:dev_manual:chap:parameter_documentation:sec:features:subsec:oceanic_plate)=
-Unit tests
+Oceanic plate
 ==========
 
 ```{todo}
diff --git a/doc/sphinx/user_manual/parameter_documentation/features/subducting_plate.md b/doc/sphinx/user_manual/parameter_documentation/features/subducting_plate.md
index 22a40f023..959edb244 100644
--- a/doc/sphinx/user_manual/parameter_documentation/features/subducting_plate.md
+++ b/doc/sphinx/user_manual/parameter_documentation/features/subducting_plate.md
@@ -1,5 +1,5 @@
 (part:dev_manual:chap:parameter_documentation:sec:features:subsec:subducting_plate)=
-Unit tests
+Subducting plate
 ==========
 
 ```{todo}