Update draft-homburg-deleg-incremental-deleg.md

Co-authored-by: Maarten Aertsen <[email protected]>

draft-homburg-deleg-incremental-deleg.md

@@ -580,7 +580,7 @@ Furthermore, the zone owner controls the duration a resolver has registered the
 
 **Note to the RFC Editor**: please remove this entire section before publication.
 
-Jesse van Zutphen has build a proof of concept implementation of support of delegations as specified in this document for the Unbound recursive resolver as part of his master thesis for the Security and Network Engineering master program of the University of Amsterdam.
+Jesse van Zutphen has built a proof of concept implementation supporting delegations as specified in this document for the Unbound recursive resolver as part of his master thesis for the Security and Network Engineering master program of the University of Amsterdam.
 The source code of his implementation is available on github {{DELEG4UNBOUND}}
 
 # Security Considerations