mention clauses 4 and 5 instead 3

src/main/clas/signed-clas.txt

@@ -67,10 +67,11 @@ Public License 1.0 (in addition to LGPL) in logback version
 logback and it was a fairly painless process. Without the CLA on file,
 dual-licensing logback would have been near impossible.
 
-3) by virtue of clause 3 of the CLA, the contributor vouches for
-his/her contributions as his/her own. Thus, QOS.ch takes a lesser risk
-when distributing software because QOS.ch can claim that some vetting
-has been performed (due diligence). 
+3) by virtue of clauses 4 and 5 of the CLA, the contributor vouches
+for his/her contributions as his/her own and that he/she is entitled
+to grant the license. Thus, QOS.ch takes a lesser risk when
+distributing software because QOS.ch can claim that some vetting has
+been performed (due diligence).
 
 A more detailed discussion of CLAs can be found at [2].