diff --git a/Documentation/osla.md b/Documentation/osla.md
index 2c75501..436a396 100644
--- a/Documentation/osla.md
+++ b/Documentation/osla.md
@@ -91,7 +91,7 @@ eg: `PreviewDataType=RGB565` and `LayerDataType=PNG`
 ## Structure
 
 1. [File] (150 bytes)
-2. [Header] (193 bytes)
+2. [Header] (197 bytes)
 3. [Custom table] (0 or more bytes)
 4. [Previews] (0 or more)
    - Preview 1 (8 bytes + sizeof(preview image data))
@@ -127,9 +127,10 @@ PreviewDataType=RGB565\0\0\0\0\0\0\0\0\0\0 (char[16]) compressed image data type
 LayerDataType=PNG\0\0\0\0\0\0\0\0\0\0\0\0\0 (char[16]) compressed image data type, eg: RLE-XXX or PNG or JPG or BMP OR other?
 PreviewTableSize=8 (uint), Size of each preview table
 PreviewCount=2 (byte) Number of previews/thumbnails on this file
-LayerTableSize=4 (uint), Size of each layer table
+LayerHeight=0.05 (float) Layer height in mm
 BottomLayerCount=4 (ushort) Total number of bottom/burn layers
 LayerCount=1000 (uint) Total number of layers
+LayerTableSize=4 (uint), Size of each layer table
 LayerDefinitionsAddress=00000 (uint) Address for layer definition start
 GCodeAddress=000000 (uint) Address for gcode definition start
 PrintTime=12345 (uint) Print time in seconds
diff --git a/Scripts/010 Editor/osla.bt b/Scripts/010 Editor/osla.bt
index 3740ef8..c56b8e3 100644
--- a/Scripts/010 Editor/osla.bt	
+++ b/Scripts/010 Editor/osla.bt	
@@ -33,9 +33,10 @@ struct HEADER {
     uint PreviewTableSize <fgcolor=cBlack, bgcolor=cRed>;
     uint PreviewCount <fgcolor=cBlack, bgcolor=cRed>;
 
-    uint LayerTableSize <fgcolor=cBlack, bgcolor=cRed>;
+    float LayerHeight <fgcolor=cBlack, bgcolor=cRed>;
     ushort BottomLayersCount <fgcolor=cBlack, bgcolor=cRed>;
     uint LayerCount <fgcolor=cBlack, bgcolor=cRed>;
+    uint LayerTableSize <fgcolor=cBlack, bgcolor=cRed>;
     uint LayerDefinitionsAddress <fgcolor=cBlack, bgcolor=cRed>;
 
     uint GCodeAddress <fgcolor=cBlack, bgcolor=cRed>;