Ham-Button.md

@@ -265,3 +265,14 @@ ButtonPlaceEnum.Horizontal puts boom-buttons in a horizontal line, notice that `
 8. ButtonPlaceEnum.Vertical(in .java) or bmb_buttonPlace_vertical(in .xml)  
 ButtonPlaceEnum.Vertical puts boom-buttons in a vertical line, notice that `ButtonPlaceEnum.Vertical.buttonNumber()` returns `Integer.MAX_VALUE`.  
 <img src="https://github.com/Nightonke/BoomMenu/blob/master/Pictures/button-place-enum/ham-button/vertical.png">
+
+### The Special Boom-Button
+Sometimes we need to add a boom-button with "Cancel" on the last boom-button(the bottom one). And maybe the last one should have a larger top-margin with its above one. Then you can set this special attribute by:
+```
+bmb.setBottomHamButtonTopMargin(Util.dp2px(50));
+```
+Or in .xml:
+```
+app:bmb_bottomHamButtonTopMargin="50dp"
+```
+<img src="https://github.com/Nightonke/BoomMenu/blob/master/Pictures/bottom-ham-top-margin.png" width="300">
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