diff --git a/README.md b/README.md
index d3e8ad5..24b4596 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ Or you can consider to bind custom hotkeys to those commands according to [#29](
       - [List](#list)
       - [Links](#links)
     - [Copy / OCR issues](#copy--ocr-issues)
-    - [Academic/Study](#academicstudy)
+    - [Academic / Study](#academic--study)
     - [Advanced custom](#advanced-custom)
     - [Others](#others)
   - [Support](#support)
@@ -103,15 +103,15 @@ Or you can consider to bind custom hotkeys to those commands according to [#29](
 | Replace **ligature**                               | Replace [ligature](https://en.wikipedia.org/wiki/Ligature_(writing)) to Non-ligature [#24](https://github.com/Benature/obsidian-text-format/issues/24)                                                                                             |
 
 
-### Academic/Study
+### Academic / Study
 
-| Command                                        | Description                                                                  |
-| ---------------------------------------------- | ---------------------------------------------------------------------------- |
-| Convert selection into **Anki** card format    | [#32](https://github.com/Benature/obsidian-text-format/pull/32)              |
-| Remove citation index                          | e.g., `A research [12] about notes` => `A research about notes`              |
-| Get **Zotero** note from clipboard and paste ⚙️ | See [below ⬇️](#zotero-format)                                                |
-| Convert single letter into **math** mode       | e.g. convert `P` into `$P$` (latex), apply for all single letter except `a`. |
-| Convert **Mathpix** array to markdown table    | Convert latex array generated by Mathpix to markdown table format            |
+| Command                                                | Description                                                                  |
+| ------------------------------------------------------ | ---------------------------------------------------------------------------- |
+| Convert selection into **Anki** card format            | [#32](https://github.com/Benature/obsidian-text-format/pull/32)              |
+| Remove citation index                                  | e.g., `A research [12] about notes` => `A research about notes`              |
+| Get **Zotero** note from clipboard and paste ⚙️         | See [below ⬇️](#zotero-format)                                                |
+| Detect and convert characters to **math mode** (LaTeX) | e.g. convert `P` into `$P$` (latex), apply for all single letter except `a`. |
+| Convert **Mathpix** array to markdown table            | Convert latex array generated by Mathpix to markdown table format            |
 
 
 
diff --git a/docs/Examples.md b/docs/Examples.md
index 86bf055..09015f0 100644
--- a/docs/Examples.md
+++ b/docs/Examples.md
@@ -151,8 +151,15 @@ When the settings are
 + 中文标点异常。比如是复制的文本，或者是 OCR 的结果。
 ```
 
-...
+# Academic / Study
+
+## Math mode
 
+```diff
+- Suppose variable x1 add x2 equals to variable Y.
++ Suppose variable $x_1$ add $x_2$ equals to variable $Y$.
 
 
+...
+
 > Note: The document is still under development.
\ No newline at end of file
diff --git a/main.ts b/main.ts
index 6cd861e..a223c18 100644
--- a/main.ts
+++ b/main.ts
@@ -597,6 +597,7 @@ export default class TextFormat extends Plugin {
   }
 
   log(...args: any[]): void {
+    // TODO: add verbose log setting
     if (true) {
       console.log(...args);
     }
@@ -664,7 +665,6 @@ export default class TextFormat extends Plugin {
       this.log("adjustRange", adjustRange)
       const selectedText = editor.getRange(adjustRange.from, adjustRange.to);
       this.log("selectedText", selectedText)
-      // let cursorOffset = 0;
       //: MODIFY SELECTION
       let replacedText: string;
       try {
@@ -676,14 +676,11 @@ export default class TextFormat extends Plugin {
               if (adjustRange.from.line == adjustRange.to.line) {
                 const headingRes = headingLevel(selectedText, context);
                 replacedText = headingRes.text;
-                // cursorOffset = headingRes.offset;
               } else {
                 replacedText = "";
-                // cursorOffset = 0;
                 selectedText.split("\n").forEach((line, index) => {
                   const headingRes = headingLevel(line, context, true);
                   replacedText += headingRes.text + "\n";
-                  // cursorOffset += headingRes.offset;
                 });
                 replacedText = replacedText.slice(0, -1); // remove the last `\n`
               }
diff --git a/manifest-beta.json b/manifest-beta.json
index 0a36e88..c02aa35 100644
--- a/manifest-beta.json
+++ b/manifest-beta.json
@@ -1,7 +1,7 @@
 {
 	"id": "obsidian-text-format",
 	"name": "Text Format",
-	"version": "3.0.0-b4",
+	"version": "3.0.0-b5",
 	"minAppVersion": "0.9.7",
 	"description": "Format text such as lowercase/uppercase/capitalize/titlecase, converting order/bullet list, removing redundant spaces/newline characters.",
 	"author": "Benature",