diff --git a/Orthtree/doc/Orthtree/Orthtree.txt b/Orthtree/doc/Orthtree/Orthtree.txt
index 5677672b3ca..0a957a6fa51 100644
--- a/Orthtree/doc/Orthtree/Orthtree.txt
+++ b/Orthtree/doc/Orthtree/Orthtree.txt
@@ -258,12 +258,12 @@ For nontrivial point counts, the naive approach's calculation time dwarfs that o
 
 \section Section_Orthtree_History History
 
-A prototype code was provided by Tong Zhao and Cédric Portaneri. From
-this prototype code, the package was developed by Jackson Campolatarro
-as part of the Google Summer of Code 2020. Simon Giraudot, supervisor
-of the GSoC internship, completed and finalized the package for
-integration in CGAL 5.3. Pierre Alliez provided kind help and advice
-all the way through.
+A prototype code was implemented by Pierre Alliez and improved by Tong
+Zhao and Cédric Portaneri. From this prototype code, the package was
+developed by Jackson Campolatarro as part of the Google Summer of Code
+2020. Simon Giraudot, supervisor of the GSoC internship, completed and
+finalized the package for integration in CGAL 5.3. Pierre Alliez
+provided kind help and advice all the way through.
 
 */