diff --git a/mba/ch36.org b/mba/ch36.org
index f7d38b7..b145125 100644
--- a/mba/ch36.org
+++ b/mba/ch36.org
@@ -25,6 +25,13 @@
 - used in case the inventory has to be discounted (ie the inventory just got recalled)
 
 ** Leverage Ratios
-- Debt to total assets = debt / assets
-- Interest coverage = EBITDA / interest
+*** EBITDA
+- *definition:* Earnings Before Interest Taxes, Depreciation and Amoritization
+- *formula:*
+  - \( \text{EBITDA} = \text{Net Income} + \text{Interest} + \text{Taxes} + \text{Depreciation} + \text{Amoritization}\)
+
+  - \( \text{EBITDA} = \text{Operating Income} +  \text{Depreciation} + \text{Amoritization}\)
+
+*** Debt to total assets = debt / assets
+*** Interest coverage = EBITDA / interest
   - Earnings Before Interest Taxes Depreciation and Amoritization