diff --git a/bsip-0038.md b/bsip-0038.md
index 093681f..62dca9d 100644
--- a/bsip-0038.md
+++ b/bsip-0038.md
@@ -103,9 +103,6 @@ The result is a rational number as well.
 As described in [BSIP 35](bsip-0035.md), at last we need to convert the
 rational numbers to integers, so rounding is involved.
 
-Since maximum debt to cover is primarily used in order matching algorithm, we
-will only focus on it here.
-
 When calculating maximum debt to cover, the goal is to go over the specified
 target but not go too far beyond.
 That said, if a short position got matched with a big limit order, after
@@ -115,6 +112,19 @@ fraction, need to plus it by one Satoshi; otherwise, need to round it up.
 An effectively same approach is to round down then add one Satoshi onto the
 result.
 
+With `max_debt_to_cover` in integer, `max_amount_to_sell` in integer should be
+calculated as:
+
+```
+max_amount_to_sell = round_up(max_debt_to_cover / match_price)
+```
+
+Then adjust `max_debt_to_cover` to be more accurate with:
+
+```
+max_debt_to_cover = round_down(max_amount_to_sell * match_price)
+```
+
 ## Rounding on Order Matching, and Edge Cases
 
 Rounding rules about order matching are defined in [BSIP 35](bsip-0035.md).