readme update

README.md

@@ -27,10 +27,11 @@ Species             |  ID        |  Estimated size (Mbp) | C-value
 --------------------|------------|-----------------------|---------
 _Diplodus sargus_   |  `sar`     |  567                  | 0.58
 _Mullus surmuletus_ |  `mullus`  |  636                  | 0.65
-_Serranus cabrilla_ |  `serran`  |  792                  | 0.81*
+_Serranus cabrilla_ |  `serran`  |  792                  | 0.81**
 
-Estimated size : genome size estimation with C-value from the [Animal Genome Size Database](http://www.genomesize.com). Formula is _Estimated size = C-value x 0,978 x 10⁹_.
+- Estimated size : genome size estimation with C-value from the [Animal Genome Size Database](http://www.genomesize.com). Formula is _Estimated size = C-value x 0,978 x 10⁹_.
 
+**_As Serranus cabrilla was not available for Animal Genome Size Database, we used a C-value for Serranus hepatus_
 
 The three draft genomes were sequenced using NGS technologies.