diff --git a/NOTES.thy b/src/tests/Isabelle2021-1.thy
similarity index 96%
rename from NOTES.thy
rename to src/tests/Isabelle2021-1.thy
index 737fb3d2..bec44b9c 100644
--- a/NOTES.thy
+++ b/src/tests/Isabelle2021-1.thy
@@ -1,6 +1,6 @@
 chapter \<open>Notes on Isabelle/DOF for Isabelle2021-1\<close>
 
-theory NOTES
+theory "Isabelle2021-1"
   imports Main
 begin
 
@@ -16,10 +16,6 @@ text \<open>
 
       \<^verbatim>\<open>isabelle components -l\<close>
 
-  \<^item> In the private terminology of Burkhart, the word "component" has a
-  different meaning: a tool implemented in Isabelle/ML that happens to
-  declare context data (many ML tools do that, it is not very special,
-  similar to defining a \<^verbatim>\<open>datatype\<close> or \<^verbatim>\<open>structure\<close> in ML).
 \<close>
 
 
@@ -252,4 +248,4 @@ ML \<open>
 
 end
 
-(* :maxLineLen=75: *)
\ No newline at end of file
+(* :maxLineLen=75: *)
diff --git a/src/tests/ROOT b/src/tests/ROOT
index 4ef831b9..d9a69c26 100755
--- a/src/tests/ROOT
+++ b/src/tests/ROOT
@@ -7,5 +7,6 @@ session "Isabelle_DOF-tests" = "Isabelle_DOF" +
     "TermAntiquotations"
     "Attributes"
     "Evaluation"
+    "Isabelle2021-1"
     "High_Level_Syntax_Invariants"
     "Ontology_Matching_Example"