diff --git a/src/main/java/com/glencoesoftware/bioformats2raw/Converter.java b/src/main/java/com/glencoesoftware/bioformats2raw/Converter.java
index 53f05ca..7e556dc 100644
--- a/src/main/java/com/glencoesoftware/bioformats2raw/Converter.java
+++ b/src/main/java/com/glencoesoftware/bioformats2raw/Converter.java
@@ -665,6 +665,39 @@ public void convert()
         scaleFormatString = "%s/%s/%d/%d";
       }
 
+      // fileset level metadata
+      if (!noRootGroup) {
+        final ZarrGroup root = ZarrGroup.create(getRootPath());
+        Map<String, Object> attributes = new HashMap<String, Object>();
+        attributes.put("bioformats2raw.layout", LAYOUT);
+
+        root.writeAttributes(attributes);
+      }
+      if (!noOMEMeta) {
+        Path metadataPath = getRootPath().resolve("OME");
+        final ZarrGroup root = ZarrGroup.create(metadataPath);
+        Map<String, Object> attributes = new HashMap<String, Object>();
+
+        // record the path to each series (multiscales) and the corresponding
+        // series (OME-XML Image) index
+        // using the index as the key would mean that the index is stored
+        // as a string instead of an integer
+        List<String> groups = new ArrayList<String>();
+        for (Integer index : seriesList) {
+          String resolutionString = String.format(
+                  scaleFormatString, getScaleFormatStringArgs(index, 0));
+          String seriesString = "";
+          if (resolutionString.indexOf('/') >= 0) {
+            seriesString = resolutionString.substring(0,
+                resolutionString.lastIndexOf('/'));
+          }
+          groups.add(seriesString);
+        }
+        attributes.put("series", groups);
+
+        root.writeAttributes(attributes);
+      }
+
       for (Integer index : seriesList) {
         try {
           write(index);
@@ -1215,14 +1248,6 @@ public void saveResolutions(int series)
         sizeX, tileWidth, sizeY, tileHeight, sizeZ, chunkDepth, imageCount
     );
 
-    // fileset level metadata
-    if (!noRootGroup) {
-      final ZarrGroup root = ZarrGroup.create(getRootPath());
-      Map<String, Object> attributes = new HashMap<String, Object>();
-      attributes.put("bioformats2raw.layout", LAYOUT);
-      root.writeAttributes(attributes);
-    }
-
     // series level metadata
     setSeriesLevelMetadata(series, resolutions);
 
diff --git a/src/test/java/com/glencoesoftware/bioformats2raw/test/ZarrTest.java b/src/test/java/com/glencoesoftware/bioformats2raw/test/ZarrTest.java
index 437f3d5..33a179b 100644
--- a/src/test/java/com/glencoesoftware/bioformats2raw/test/ZarrTest.java
+++ b/src/test/java/com/glencoesoftware/bioformats2raw/test/ZarrTest.java
@@ -210,6 +210,13 @@ public void testAdditionalScaleFormatStringArgs() throws Exception {
     series0.openArray("0");
     series0 = ZarrGroup.open(output.resolve("ghi/999/1").toString());
     series0.openArray("0");
+
+    Path omePath = output.resolve("OME");
+    ZarrGroup z = ZarrGroup.open(omePath.toString());
+    List<String> groupMap = (List<String>) z.getAttributes().get("series");
+    assertEquals(groupMap.size(), 2);
+    assertEquals(groupMap.get(0), "abc/888/0");
+    assertEquals(groupMap.get(1), "ghi/999/1");
   }
 
   /**
@@ -240,6 +247,14 @@ public void testDefaultLayoutIsSetAndIsNested() throws Exception {
     ZarrGroup z = ZarrGroup.open(output.toString());
     Integer layout = (Integer)
         z.getAttributes().get("bioformats2raw.layout");
+
+    Path omePath = output.resolve("OME");
+    ZarrGroup omeGroup = ZarrGroup.open(omePath.toString());
+    List<String> groupMap =
+      (List<String>) omeGroup.getAttributes().get("series");
+    assertEquals(groupMap.size(), 1);
+    assertEquals(groupMap.get(0), "0");
+
     ZarrArray series0 = ZarrGroup.open(output.resolve("0")).openArray("0");
 
     // no getter for DimensionSeparator in ZarrArray
@@ -428,6 +443,14 @@ public void testMultiSeries() throws Exception {
     assertTool();
     ZarrGroup z = ZarrGroup.open(output.toString());
 
+    Path omePath = output.resolve("OME");
+    ZarrGroup omeGroup = ZarrGroup.open(omePath.toString());
+    List<String> groupMap =
+      (List<String>) omeGroup.getAttributes().get("series");
+    assertEquals(groupMap.size(), 2);
+    assertEquals(groupMap.get(0), "0");
+    assertEquals(groupMap.get(1), "1");
+
     // Check series 0 dimensions and special pixels
     ZarrArray series0 = z.openArray("0/0");
     assertArrayEquals(new int[] {1, 1, 1, 512, 512}, series0.getShape());
@@ -462,6 +485,16 @@ public void testSingleBeginningSeries() throws Exception {
     assertTool("-s", "0");
     ZarrGroup z = ZarrGroup.open(output.toString());
 
+    Path omePath = output.resolve("OME");
+    ZarrGroup omeGroup = ZarrGroup.open(omePath.toString());
+    List<String> groupMap =
+      (List<String>) omeGroup.getAttributes().get("series");
+    assertEquals(groupMap.size(), 1);
+    assertEquals(groupMap.get(0), "0");
+
+    OME ome = getOMEMetadata();
+    assertEquals(1, ome.sizeOfImageList());
+
     // Check series 0 dimensions and special pixels
     ZarrArray series0 = z.openArray("0/0");
     assertArrayEquals(new int[] {1, 1, 1, 512, 512}, series0.getShape());
@@ -489,6 +522,16 @@ public void testSingleEndSeries() throws Exception {
     assertTool("-s", "1");
     ZarrGroup z = ZarrGroup.open(output.toString());
 
+    Path omePath = output.resolve("OME");
+    ZarrGroup omeGroup = ZarrGroup.open(omePath.toString());
+    List<String> groupMap =
+      (List<String>) omeGroup.getAttributes().get("series");
+    assertEquals(groupMap.size(), 1);
+    assertEquals(groupMap.get(0), "0");
+
+    OME ome = getOMEMetadata();
+    assertEquals(1, ome.sizeOfImageList());
+
     // Check series 1 dimensions and special pixels
     ZarrArray series0 = z.openArray("0/0");
     assertArrayEquals(new int[] {1, 1, 1, 512, 512}, series0.getShape());
@@ -516,6 +559,16 @@ public void testSingleMiddleSeries() throws Exception {
     assertTool("-s", "1");
     ZarrGroup z = ZarrGroup.open(output.toString());
 
+    Path omePath = output.resolve("OME");
+    ZarrGroup omeGroup = ZarrGroup.open(omePath.toString());
+    List<String> groupMap =
+      (List<String>) omeGroup.getAttributes().get("series");
+    assertEquals(groupMap.size(), 1);
+    assertEquals(groupMap.get(0), "0");
+
+    OME ome = getOMEMetadata();
+    assertEquals(1, ome.sizeOfImageList());
+
     // Check series 1 dimensions and special pixels
     ZarrArray series0 = z.openArray("0/0");
     assertArrayEquals(new int[] {1, 1, 1, 512, 512}, series0.getShape());
@@ -912,11 +965,21 @@ public void testNoHCSOption() throws Exception {
 
     ZarrGroup z = ZarrGroup.open(output);
 
+    Path omePath = output.resolve("OME");
+    ZarrGroup omeGroup = ZarrGroup.open(omePath.toString());
+    List<String> groupMap =
+      (List<String>) omeGroup.getAttributes().get("series");
+    assertEquals(groupMap.size(), 12);
+    for (int i=0; i<12; i++) {
+      assertEquals(groupMap.get(i), String.valueOf(i));
+    }
+
     // Check dimensions and block size
     ZarrArray series0 = z.openArray("0/0");
     assertArrayEquals(new int[] {1, 1, 1, 512, 512}, series0.getShape());
     assertArrayEquals(new int[] {1, 1, 1, 512, 512}, series0.getChunks());
-    assertEquals(12, z.getGroupKeys().size());
+    // 12 series + OME group
+    assertEquals(13, z.getGroupKeys().size());
 
     // Check OME metadata
     OME ome = getOMEMetadata();
@@ -952,6 +1015,22 @@ public void testHCSMetadata() throws Exception {
     int rowCount = 2;
     int colCount = 3;
     int fieldCount = 2;
+
+    Path omePath = output.resolve("OME");
+    ZarrGroup omeGroup = ZarrGroup.open(omePath.toString());
+    List<String> groupMap =
+      (List<String>) omeGroup.getAttributes().get("series");
+    assertEquals(groupMap.size(), 12);
+    int index = 0;
+    for (int r=0; r<rowCount; r++) {
+      for (int c=0; c<colCount; c++) {
+        for (int f=0; f<fieldCount; f++) {
+          String groupPath = (char) (r + 'A') + "/" + (c + 1) + "/" + f;
+          assertEquals(groupMap.get(index++), groupPath);
+        }
+      }
+    }
+
     Map<String, List<String>> plateMap = new HashMap<String, List<String>>();
     plateMap.put("A", Arrays.asList("1", "2", "3"));
     plateMap.put("B", Arrays.asList("1", "2", "3"));
@@ -1390,6 +1469,8 @@ public void testNoOmeMetaExportOption() throws Exception {
 
     assertTrue(!Files.exists(
       output.resolve("OME").resolve("METADATA.ome.xml")));
+    assertTrue(!Files.exists(
+      output.resolve("OME").resolve(".zattrs")));
   }
 
   /**