diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index cde0db8..b74297e 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -59,4 +59,9 @@ jobs:
         ./src/jacotest -r 1 -j openjdk
         ./src/jacotest -r 2 -j openjdk
         ./src/jacotest -z -v -j openjdk
-        
+
+    - name: Show subclassing in test cases
+      run: |
+         if [ "$RUNNER_OS" == "Linux" ]; then
+              ./show_subclassing.sh
+         fi
diff --git a/HISTORY.md b/HISTORY.md
index 0f45415..189c105 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -5,6 +5,7 @@ This file is a version history of jacotest amendments.  Entries appear in versio
 | :------------: | :---: | :--- |
 |<img width=90/>|<img width=60/>|<img width=600/>|
 | 2025-01-30 | 3.5.5 | Updated ERROR_CATEGORIES.txt to prioritize reporting stack {under,over}flows. |
+| | | Added show_subclassing.sh to gather subclassing information. |
 | 2025-01-21 | 3.5.4 | Added more functions to test case atomic-integer. |
 | 2025-01-16 | 3.5.3 | New test case: blocking-queues-2-3-5. |
 | 2025-01-09 | 3.5.2 | New test case: iface-with-default-func. |
diff --git a/show_subclassing.sh b/show_subclassing.sh
new file mode 100755
index 0000000..c3b7a7c
--- /dev/null
+++ b/show_subclassing.sh
@@ -0,0 +1,19 @@
+set -e
+set pipefail
+MYNAME=`basename $0`
+
+if [ ! -r VERSION.txt ]; then 
+	echo '*** '$MYNAME': Wrong current directory!'
+	exit 86
+fi
+
+# Starting at ./tests,
+# 1. Find all occurences of main.java and grep all "class" statements, keeping the file paths (-H) and ignoring case (-i).
+# 2. From that, ignore case and throw out (-v) the "class main" statements.
+# 3. From that, remove the directory prefix, yielding only the jacotest case  (directory) name.
+#
+# 1 vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv         2 vvvvvvvvvvvvvvvvvvv        3 vvvvvvvvvvvvvvvvvvvvvv
+echo
+echo $MYNAME': Jacotest case files exhibiting subordinate classes (duplicate entries are possible):' 2>&1  | tee $MYNAME.log
+echo 2>&1  | tee -a $MYNAME.log
+find ./tests -name main.java -exec grep -iH " class " {} \;  2>&1 | grep -iv "class main" 2>&1 | sed -e "s/\.\/tests\///" 2>&1  | tee -a $MYNAME.log