diff --git a/PixelatorControllerSettings.md b/PixelatorControllerSettings.md
index 61464ec..55e4631 100644
--- a/PixelatorControllerSettings.md
+++ b/PixelatorControllerSettings.md
@@ -431,4 +431,87 @@ See source:trunk/PixelatorController/config/topup.json for an example.
 &emsp;Float value defines the delay (in seconds) between when the topup signal stops and when stxm measurements resume.<BR>
 &emsp;**Default**: 0
  
-## Zone Plate
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+## Zone Plate
+This file contains the zone plate and OSA settings.
+
+**activeOSA**::<BR>
+&emsp;String corresponding to the name (defined in **OSAs**) of the currently selected OSA.
+
+**activeZonePlate**::<BR>
+&emsp;String corresponding to the name (defined in **zonePlates**) of the currently selected zone plate.
+
+**autoFocusDeadBand**::<BR>
+&emsp;Double value that defines the energy difference (from value at last focus) needed to trigger a movement of the zone plate Z-axis to compensate for the change in zone plate focus length. Units match the "energy" positioner.<BR>
+&emsp;**Default**: 0.5
+
+**dOsa**::<BR>
+&emsp;Double value defines the Z-distance between the OSA and the focal plane of the zone plate.
+
+**distance_exitSlit_OSA**::<BR>
+&emsp;Double value defines distance between the secondary source (i.e. exit slits) and the OSA. This is used for optical geometry calculations to position the zone plate correctly.
+
+**OSAs**::<BR>
+&emsp;JSON list
+
+**zonePlates**::<BR>
+&emsp;
+
+
+```json
+  "OSAs" : [
+      {
+         "diameter" : {
+            "unit" : "μm",
+            "value" : 50.0
+         },
+         "name" : "OSA 50"
+      },
+      {
+         "diameter" : {
+            "unit" : "μm",
+            "value" : 60.0
+         },
+         "name" : "OSA 60"
+      },
+      {
+         "diameter" : {
+            "unit" : "μm",
+            "value" : 70.0
+         },
+         "name" : "OSA 70"
+      }
+   ],
+   "activeOSA" : "OSA 50",
+   "activeZonePlate" : "ZonePlate B",
+   "autoFocusDeadBand" : 0.5,
+   "dOsa" : 298.0,
+   "distance_exitSlit_OSA" : 1005000,
+   "zonePlates" : [
+      {
+         "NXgeometry" : "\"Engineering\" position of the fresnel zone plate",
+         "b" : [ 0, 6.8750 ],
+         "central_stop_diameter" : {
+            "unit" : "μm",
+            "value" : 75
+         },
+         "central_stop_material" : "Pb",
+         "central_stop_thickness" : 500,
+         "fabrication" : "etched",
+         "geometry" : {
+            "class" : "NXgeometry",
+            "translation" : {
+               "class" : "NXtranslation",
+               "distances" : [ 0.0, 0.0, -35.0 ]
+            }
+         },
+         "mask_material" : "mask",
+         "mask_thickness" : 400,
+         "name" : "ZonePlate B",
+         "outer_diameter" : 240,
+         "outermost_zone_width" : 35,
+         "support_membrane_material" : "membrane",
+         "support_membrane_thickness" : 300,
+         "zone_height" : 200,
+         "zone_material" : "Pt",
+         "zone_support_material" : "air ;)"
+```
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