diff --git a/AddressableImporter/Editor/AddressableImportRule.cs b/AddressableImporter/Editor/AddressableImportRule.cs
index 817cb70..8249c04 100644
--- a/AddressableImporter/Editor/AddressableImportRule.cs
+++ b/AddressableImporter/Editor/AddressableImportRule.cs
@@ -32,6 +32,12 @@ public class AddressableImportRule
     /// </summary>
     public AddressableImportRuleMatchType matchType;
 
+    /// <summary>
+    /// Addressable group name
+    /// </summary>
+    [Tooltip("Leaves blank for the default group.")]
+    public string groupName;
+
     /// <summary>
     /// Label reference list
     /// </summary>
diff --git a/AddressableImporter/Editor/AddressableImporter.cs b/AddressableImporter/Editor/AddressableImporter.cs
index 94a2eba..e2cf830 100644
--- a/AddressableImporter/Editor/AddressableImporter.cs
+++ b/AddressableImporter/Editor/AddressableImporter.cs
@@ -10,7 +10,6 @@ public class AddressableImporter : AssetPostprocessor
 {
     static void OnPostprocessAllAssets(string[] importedAssets, string[] deletedAssets, string[] movedAssets, string[] movedFromAssetPaths)
     {
-        var type = typeof(AddressableImporter);
         var settings = AddressableAssetSettingsDefaultObject.Settings;
         var importSettings = AddressableImportSettings.Instance;
         if (importSettings.rules == null || importSettings.rules.Count == 0)
@@ -22,12 +21,15 @@ static void OnPostprocessAllAssets(string[] importedAssets, string[] deletedAsse
             {
                 if (rule.Match(path))
                 {
-                    var entry = CreateOrUpdateAddressableAssetEntry(settings, path, rule.labels);
-                    entriesAdded.Add(entry);
-                    if (rule.HasLabel)
-                        Debug.LogFormat("[{0}] Entry created for {1} with labels {2}", type, path, string.Join(", ", entry.labels));
-                    else
-                        Debug.LogFormat("[{0}] Entry created for {1}", type, path);
+                    var entry = CreateOrUpdateAddressableAssetEntry(settings, path, rule.groupName, rule.labels);
+                    if (entry != null)
+                    {
+                        entriesAdded.Add(entry);
+                        if (rule.HasLabel)
+                            Debug.LogFormat("[AddressableImporter] Entry created for {0} with labels {1}", path, string.Join(", ", entry.labels));
+                        else
+                            Debug.LogFormat("[AddressableImporter] Entry created for {0}", path);
+                    }
                 }
             }
         }
@@ -35,9 +37,14 @@ static void OnPostprocessAllAssets(string[] importedAssets, string[] deletedAsse
             settings.SetDirty(AddressableAssetSettings.ModificationEvent.EntryMoved, entriesAdded, true);
     }
 
-    static AddressableAssetEntry CreateOrUpdateAddressableAssetEntry(AddressableAssetSettings settings, string path, IEnumerable<string> labels)
+    static AddressableAssetEntry CreateOrUpdateAddressableAssetEntry(AddressableAssetSettings settings, string path, string groupName, IEnumerable<string> labels)
     {
-        var group = settings.DefaultGroup;
+        var group = GetGroup(settings, groupName);
+        if (group == null)
+        {
+            Debug.LogErrorFormat("[AddressableImporter] Failed to find group {0} when importing {1}. Please check the group exists, then reimport the asset.", groupName, path);
+            return null;
+        }
         var guid = AssetDatabase.AssetPathToGUID(path);
         var entry = settings.CreateOrMoveEntry(guid, group);
         // Override address if address is a path
@@ -51,5 +58,18 @@ static AddressableAssetEntry CreateOrUpdateAddressableAssetEntry(AddressableAsse
         }
         return entry;
     }
+
+    /// <summary>
+    /// Find asset group by given name. Return default group if given name is null.
+    /// </summary>
+    static AddressableAssetGroup GetGroup(AddressableAssetSettings settings, string groupName)
+    {
+        if (groupName != null)
+            groupName.Trim();
+        if (string.IsNullOrEmpty(groupName))
+            return settings.DefaultGroup;
+        return settings.groups.Find(g => g.Name == groupName);
+    }
+
 }
 
diff --git a/LICENSE.meta b/LICENSE.meta
new file mode 100644
index 0000000..d08e332
--- /dev/null
+++ b/LICENSE.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 625fa35101860bf4f8c1d4903253c9ce
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/README.md b/README.md
index 8deb03b..316a3e0 100644
--- a/README.md
+++ b/README.md
@@ -5,20 +5,21 @@ The importer marks assets as addressable, by applying to files having a path mat
 
 ## Usage
 
-You should create a single AddressableImportSettings file located at `Assets/AddressableAssetsData/AddressableImportSettings.asset` in your project. To create it, go to `Assets/AddressableAssetsData` folder, right click in your project window and choose `Create > Addressable Assets > Import Settings`.
+You should create a single AddressableImportSettings file located at `Assets/AddressableAssetsData/AddressableImportSettings.asset`. To create it, go to `Assets/AddressableAssetsData` folder, right click in your project window and choose `Create > Addressable Assets > Import Settings`.
 
-If no settings file exists, an empty one will be created for you, when import any new asset.
+If no settings file exists, an empty one will be created when importing any new asset.
 
-Once the settings file selected, you can edit rules in the inspector window.
+Once the settings file selected, you can edit rules in the inspector window. Then click `File > Save Project` to apply the changes.
 
 ![AddressableImportSettings Insepctor](./Documentation~/AddressableImportSettings-Insepctor.png)
 
-Rule properties
+Create a rule
 - Path, the path pattern
 - Match type
   - Wildcard, `*` matches any number of characters, `?` matches a single character
   - Regex
-- Label references, the labels to add
+- Group name, leaves blank for the default group
+- Labels, the labels to add
 
 Rule Examples
 
@@ -28,6 +29,6 @@ Rule Examples
 | Wildcard | Asset/Sprites/Level??/*.asset |
 | Regex    | ^Assets/Models/.*\\.fbx |
 
-Notice for moved or re-imported assets
+Notices for moved or re-imported assets
 - The importer will not override existing labels.
-- The importer will only override address if it looks like a path (starts with `Assets/`). In another word, if you changed the address, and reimport or move it later, the address remains no change.
+- The importer will only override address if it looks like a path (starts with `Assets/`). In another word, if you changed the address, then reimport or move it, the address remains no change.
diff --git a/README.md.meta b/README.md.meta
new file mode 100644
index 0000000..a2f58d1
--- /dev/null
+++ b/README.md.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 3e1da7b09b11d4844b7b157b4a914f4e
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: