diff --git a/PixelatorControllerSettings.md b/PixelatorControllerSettings.md
index d895859..e7da2bc 100644
--- a/PixelatorControllerSettings.md
+++ b/PixelatorControllerSettings.md
@@ -158,10 +158,13 @@ Each of these settings files is described in a section below.
  [Zone Plate](#zone-plate)
 
 ## Axis
+Definition of coordinate axes names to be referenced by positioners with the **axisName** setting.
 
 ## Controller
+Definition of a set of hardware controllers.
 
 ## Detector
+Definitions of the set of detector hardware available.
 
 ## Epics
 This file contains global epics settings.