diff --git a/doc/reference/api.rst b/doc/reference/api.rst
index 837af8211f3..06064bd3edc 100644
--- a/doc/reference/api.rst
+++ b/doc/reference/api.rst
@@ -1,121 +1,121 @@
 .. _api:
 
-Auto-generated API Documentation
-################################
+API Documentation
+#################
 
 Nanokernel
-==========
+**********
 
 Fibers
---------
+======
 
 .. doxygengroup:: nanokernel_fiber
    :project: Zephyr
    :content-only:
 
 Semaphores
------------
+==========
 
 .. doxygengroup:: nanokernel_semaphore
    :project: Zephyr
    :content-only:
 
 LIFOs
------------
+=====
 
 .. doxygengroup:: nanokernel_lifo
    :project: Zephyr
    :content-only:
 
 FIFOs
------------
+=====
 
 .. doxygengroup:: nanokernel_fifo
    :project: Zephyr
    :content-only:
 
 Stacks
------------
+======
 
 .. doxygengroup:: nanokernel_stack
    :project: Zephyr
    :content-only:
 
 Timers
------------
+======
 
 .. doxygengroup:: nanokernel_timer
    :project: Zephyr
    :content-only:
 
 Microkernel
-===========
+***********
 
 Events
--------
+======
 
 .. doxygengroup:: microkernel_event
    :project: Zephyr
    :content-only:
 
 FIFOs
------
+=====
 
 .. doxygengroup:: microkernel_fifo
    :project: Zephyr
    :content-only:
 
 Pipes
------
+=====
 
 .. doxygengroup:: microkernel_pipe
    :project: Zephyr
    :content-only:
 
 Interrupt Services
-------------------
+==================
 
 .. doxygengroup:: microkernel_irq
    :project: Zephyr
    :content-only:
 
 Mailboxes
-------------------
+=========
 
 .. doxygengroup:: microkernel_mailbox
    :project: Zephyr
    :content-only:
 
 Memory Maps
-------------
+===========
 
 .. doxygengroup:: microkernel_memorymap
    :project: Zephyr
    :content-only:
 
 Mutexes
----------
+=======
 
 .. doxygengroup:: microkernel_mutex
    :project: Zephyr
    :content-only:
 
 Semaphores
------------
+==========
 
 .. doxygengroup:: microkernel_semaphore
    :project: Zephyr
    :content-only:
 
 Timers
------------
+======
 
 .. doxygengroup:: microkernel_timer
    :project: Zephyr
    :content-only:
 
 Tasks
------------
+=====
 
 .. doxygengroup:: microkernel_task
    :project: Zephyr