diff --git a/license.txt b/license.txt
index 5af6f7c5b..0ea723600 100644
--- a/license.txt
+++ b/license.txt
@@ -26,9 +26,23 @@ Copyright: 1996-2021 Dynare Team
 License: GPL-3+
 
 Files: matlab/+occbin/IVF_core.m
-       matlab/+occbin/make_chart.m
-       matlab/+occbin/map_regime.m
        matlab/+occbin/match_function.m
+Copyright: none
+License: public-domain-inversion-filter
+ Original authors: Pablo Cuba-Borda, Luca Guerrieri, and Matteo Iacoviello
+ Original file downloaded from:
+ http://www.lguerrieri.com/jae-replication.zip
+ Adapted for Dynare by Dynare Team.
+ .
+ This code is in the public domain and may be used freely.
+ However the authors would appreciate acknowledgement of the source by
+ citation of any of the following papers:
+ .
+Pablo Cuba-Borda, Luca Guerrieri, and Matteo Iacoviello (2019): "Likelihood evaluation of models 
+with occasionally binding constraints", Journal of Applied Econometrics, 34(7), 1073-1085
+
+Files: matlab/+occbin/make_chart.m
+       matlab/+occbin/map_regime.m
        matlab/+occbin/mkdata.m
        matlab/+occbin/mkdatap_anticipated_2constraints_dyn.m
        matlab/+occbin/mkdatap_anticipated_dyn.m