diff --git a/spec/024_token_info.md b/spec/024_token_info.md
index 8d14230..ff737ed 100644
--- a/spec/024_token_info.md
+++ b/spec/024_token_info.md
@@ -21,7 +21,9 @@ Enabeling users to query the info for a particular token. e.g. after choosing it
 1. Token Info:
    1. name, 
    1. symbol 
-   1. holding fee (% aggregated to monthly - calculation needed based on data from contract), 
+   1. holding fee (% aggregated to monthly - calculation needed based on data from contract), =(1-(1-Demurage)^43800) (43800 munites ina  months) ... if demurrage is 0.00000046124891913883 ... then the monthly demurage here is  =(1-(1-0.00000046124891913883)^43800)=0.02 ... 2%  ... 
+      1. note that to calculate a minute by minute demurrage based on a monthly target demurrage of 2% =1- (1-0.02)^(1/43800
+) = 0.00000046124891913883
 1. Stats:
    1. total supply, (from contract)
    1. Circulation (total minus the supply of balance of the issuer) (from contract and balance of sink account)