diff --git a/public/i18n/en_US.json b/public/i18n/en_US.json
index ab4e6f6..ad5b771 100644
--- a/public/i18n/en_US.json
+++ b/public/i18n/en_US.json
@@ -51,11 +51,15 @@
     },
     "offline": {
       "title": "Offline mode",
-      "description": "If enabled, the plugin will use a local spell checker, which is more privacy friendly and works without internet, but doesn't provide advanced grammar checking and may slow SiYuan down when a large note is being loaded."
+      "description": "If enabled, the plugin will use a local spell checker, which is more privacy friendly and works without internet, but doesn't provide advanced grammar checking.<br>If enabled, language options are overridden by \"Offline dictionaries\"."
     },
     "offlineDicts": {
       "title": "Offline dictionaries",
       "description": "Comma-separated list of dictionaries used for offline spell checking. <a href='https://github.com/wooorm/dictionaries/tree/main/dictionaries'>Available options</a>. Example: <code>en,it</code><br>Set your primary language as first, and don't include unneeded languages, as they will only use more resources."
+    },
+    "reportAuto": {
+      "title": "Notify if document language is auto",
+      "description": "Using language auto-detection is not recommended. If enabled, the system will notify you when a document's language is set to auto."
     }
   },
   "errors": {
@@ -66,7 +70,8 @@
     "correctionNotEnabled": "The correction has been copied to your clipboard. <small>Suggestions can be auto-applied when selected. Visit the plugin's settings to enable.</small>",
     "checkServer": "Failed to contact grammar checking server, make sure it's correctly set or enable Offline Mode in the plugin settings.",
     "notImplementedNotebookSettings": "Notebook-wide grammar checking settings aren't implemented yet, they will be added in a future version. Thanks for your patience!",
-    "hunspellLoadError": "Failed loading offline spell checker: "
+    "hunspellLoadError": "Failed loading offline spell checker: ",
+    "autoLanguage": "The language for this document is set to \"auto\", which is not recommended.<br>You can set the default language in plugin settings, or document-wise through Doc Tree > Plugin > SySpell.<br><small>You can disable this warning in the plugin settings.</small>"
   },
   "docMenu": {
     "documentStatus": "Document status",
diff --git a/src/index.ts b/src/index.ts
index 3abd45c..7f4c609 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -85,6 +85,9 @@ export default class SpellCheckPlugin extends Plugin {
             void this.suggestions.forAllBlocksSuggest(false, true)
             const settings = await ProtyleHelper.getDocumentSettings(event.detail.protyle.block.id,
                 this.settingsUtil.get('enabledByDefault'), this.settingsUtil.get('defaultLanguage'))
+            if(settings.language == 'auto' && this.settingsUtil.get('online')) {
+                showMessage(this.i18nx.errors.autoLanguage, -1, 'info')
+            }
             this.currentlyEditing = {
                 protyle: new ProtyleHelper(event.detail.protyle.contentElement),
                 enabled: settings.enabled,
diff --git a/src/settings.ts b/src/settings.ts
index 4503e53..8340373 100644
--- a/src/settings.ts
+++ b/src/settings.ts
@@ -109,6 +109,14 @@ export class Settings {
             value: 'auto'
         })
 
+        su.addItem({
+            type: 'checkbox',
+            key: 'reportAuto',
+            title: to.reportAuto.title,
+            description: to.reportAuto.description,
+            value: true
+        })
+
         su.addItem({
             type: 'checkbox',
             key: 'offline',