diff --git a/src/test/resources/tests/test_concat.jvcl b/src/test/resources/tests/test_concat.jvcl
index b5a932b..550de5b 100644
--- a/src/test/resources/tests/test_concat.jvcl
+++ b/src/test/resources/tests/test_concat.jvcl
@@ -1,5 +1,6 @@
 {
   "assets": [
+    // wildcard matches multiple files, vid1_splits becomes a "list" asset
     { "name": "vid1_splits", "path": "src/test/resources/outputs/vid1_splits_*.mp4" }
   ],
   "operations": [
diff --git a/src/test/resources/tests/test_letterbox.jvcl b/src/test/resources/tests/test_letterbox.jvcl
index 4276c88..863f42b 100644
--- a/src/test/resources/tests/test_letterbox.jvcl
+++ b/src/test/resources/tests/test_letterbox.jvcl
@@ -1,5 +1,6 @@
 {
   "assets": [
+    // wildcard matches multiple files, vid1_splits becomes a "list" asset
     { "name": "vid1_splits", "path": "src/test/resources/outputs/vid1_splits_*.mp4" }
   ],
   "operations": [
diff --git a/src/test/resources/tests/test_scale.jvcl b/src/test/resources/tests/test_scale.jvcl
index 0673eb7..64cc9dd 100644
--- a/src/test/resources/tests/test_scale.jvcl
+++ b/src/test/resources/tests/test_scale.jvcl
@@ -1,5 +1,6 @@
 {
   "assets": [
+    // wildcard matches multiple files, vid1_splits becomes a "list" asset
     { "name": "vid1_splits", "path": "src/test/resources/outputs/vid1_splits_*.mp4" }
   ],
   "operations": [
diff --git a/src/test/resources/tests/test_trim.jvcl b/src/test/resources/tests/test_trim.jvcl
index 8f8d669..b57f4ea 100644
--- a/src/test/resources/tests/test_trim.jvcl
+++ b/src/test/resources/tests/test_trim.jvcl
@@ -1,5 +1,6 @@
 {
   "assets": [
+    // wildcard matches multiple files, vid1_splits becomes a "list" asset
     { "name": "vid1_splits", "path": "src/test/resources/outputs/vid1_splits_*.mp4" }
   ],
   "operations": [