diff --git a/wiki/pages/contribution.html b/wiki/pages/contribution.html
index 453f624297667325f999876dd42546ebe5d16f5b..7123bb4379e755e9b1f6066dacd44723eb915319 100644
--- a/wiki/pages/contribution.html
+++ b/wiki/pages/contribution.html
@@ -172,10 +172,9 @@
                 <b>Analysis calculation</b>
                 
                 [% siRNA encapsulation efficiency] = <br>
-                
-                siRNA concentration of Triton[+] — siRNA concentration of Triton[-] 
-                <hr>
-                  siRNA concentration of Triton[+] (editing later)
+
+               [siRNA concentration of Triton[+] — siRNA concentration of Triton[-]] /siRNA concentration of Triton[+]
+                <br>
                 
             </p>
             </div>