diff --git a/benchmarks/code_gen/nota_v2.mch b/benchmarks/code_gen/nota_v2.mch
index 62b04c894ec187289c298f92c2828edf0ad21a2c..6d9a121751c39ec366061c6953c48d14d82cddd3 100644
--- a/benchmarks/code_gen/nota_v2.mch
+++ b/benchmarks/code_gen/nota_v2.mch
@@ -1,3 +1,7 @@
+/*
+I. Oliver. Experiences in Using B and UML in Industrial Development. In Proceedings Formal Specification and Development in B, B’07, page 248–251, 2007.
+Simplified version for B2Program
+*/
 MACHINE nota_v2
 // a simplified version of nota for B2Program
 
diff --git a/benchmarks/model_checking/ProB/nota_v2.mch b/benchmarks/model_checking/ProB/nota_v2.mch
index 457bf8b83cf98774bdaa65391ab4bdae72edf43e..b8661b70daac812fec9e9263e7a321df45e77b61 100644
--- a/benchmarks/model_checking/ProB/nota_v2.mch
+++ b/benchmarks/model_checking/ProB/nota_v2.mch
@@ -1,3 +1,7 @@
+/*
+I. Oliver. Experiences in Using B and UML in Industrial Development. In Proceedings Formal Specification and Development in B, B’07, page 248–251, 2007.
+Simplified version for B2Program
+*/
 MACHINE nota_v2
 // a simplified version of nota for B2Program
 
diff --git a/benchmarks/model_checking/TLC/nota_v2.mch b/benchmarks/model_checking/TLC/nota_v2.mch
index 457bf8b83cf98774bdaa65391ab4bdae72edf43e..b8661b70daac812fec9e9263e7a321df45e77b61 100644
--- a/benchmarks/model_checking/TLC/nota_v2.mch
+++ b/benchmarks/model_checking/TLC/nota_v2.mch
@@ -1,3 +1,7 @@
+/*
+I. Oliver. Experiences in Using B and UML in Industrial Development. In Proceedings Formal Specification and Development in B, B’07, page 248–251, 2007.
+Simplified version for B2Program
+*/
 MACHINE nota_v2
 // a simplified version of nota for B2Program
 
diff --git a/benchmarks/model_checking_opreuse/ProB/nota.mch b/benchmarks/model_checking_opreuse/ProB/nota.mch
index 8ebb4bbb007dcadc9bc19b155e32b92b5d86a125..78b728b8766a8afec988246097ee8fd6b9739656 100644
--- a/benchmarks/model_checking_opreuse/ProB/nota.mch
+++ b/benchmarks/model_checking_opreuse/ProB/nota.mch
@@ -1,3 +1,6 @@
+/*
+I. Oliver. Experiences in Using B and UML in Industrial Development. In Proceedings Formal Specification and Development in B, B’07, page 248–251, 2007.
+*/
 MACHINE nota
 
 /* these represent the classes */
diff --git a/benchmarks/model_checking_opreuse/ProB/nota_v2.mch b/benchmarks/model_checking_opreuse/ProB/nota_v2.mch
index 62b04c894ec187289c298f92c2828edf0ad21a2c..6d9a121751c39ec366061c6953c48d14d82cddd3 100644
--- a/benchmarks/model_checking_opreuse/ProB/nota_v2.mch
+++ b/benchmarks/model_checking_opreuse/ProB/nota_v2.mch
@@ -1,3 +1,7 @@
+/*
+I. Oliver. Experiences in Using B and UML in Industrial Development. In Proceedings Formal Specification and Development in B, B’07, page 248–251, 2007.
+Simplified version for B2Program
+*/
 MACHINE nota_v2
 // a simplified version of nota for B2Program
 
diff --git a/benchmarks/model_checking_opreuse/TLC/nota.mch b/benchmarks/model_checking_opreuse/TLC/nota.mch
index 8ebb4bbb007dcadc9bc19b155e32b92b5d86a125..78b728b8766a8afec988246097ee8fd6b9739656 100644
--- a/benchmarks/model_checking_opreuse/TLC/nota.mch
+++ b/benchmarks/model_checking_opreuse/TLC/nota.mch
@@ -1,3 +1,6 @@
+/*
+I. Oliver. Experiences in Using B and UML in Industrial Development. In Proceedings Formal Specification and Development in B, B’07, page 248–251, 2007.
+*/
 MACHINE nota
 
 /* these represent the classes */
diff --git a/benchmarks/model_checking_opreuse/TLC/nota_v2.mch b/benchmarks/model_checking_opreuse/TLC/nota_v2.mch
index 62b04c894ec187289c298f92c2828edf0ad21a2c..6d9a121751c39ec366061c6953c48d14d82cddd3 100644
--- a/benchmarks/model_checking_opreuse/TLC/nota_v2.mch
+++ b/benchmarks/model_checking_opreuse/TLC/nota_v2.mch
@@ -1,3 +1,7 @@
+/*
+I. Oliver. Experiences in Using B and UML in Industrial Development. In Proceedings Formal Specification and Development in B, B’07, page 248–251, 2007.
+Simplified version for B2Program
+*/
 MACHINE nota_v2
 // a simplified version of nota for B2Program