diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6daef45..81b7569 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change Log
 
+## 0.21.1 (March 1, 2023)
+
+- fix: add default text for ${selectedText}
+
 ## 0.21.0 (February 28, 2023)
 
 - feat: add ${selectedText} predefine
diff --git a/README.md b/README.md
index e87d72c..8c9cdad 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ Smartly paste for Markdown.
   - `${fileExtname}` - the current opened file's extension
   - `${fileDirname}` - the current opened file's directory name
   - `${datetime}` - the current date & time formatted by `"yyyyMMDDHHmmss"`, You can customize the format by format string. exp: `${datetime|yyyy-MM-DD_HH-mm-ss}`
-  - `${selectedText}` - the current selected text. If selected text contain illegal characters `\/:*?""<>|\r\n` it will return "".
+  - `${selectedText}` - the current selected text. If selected text contain illegal characters `\/:*?""<>|\r\n` it will return "". You can also set the default text, exp: `${selectedText|default text}`, If selected text contain illegal characters or selected text is empty it will return the default text.
 
 - `MarkdownPaste.path`
 
diff --git a/package.json b/package.json
index 182fc09..b938612 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "vscode-markdown-paste-image",
   "displayName": "Markdown Paste",
   "description": "A smartly paste for markdown.",
-  "version": "0.21.0",
+  "version": "0.21.1",
   "publisher": "telesoho",
   "author": {
     "name": "telesoho",
diff --git a/src/predefine.ts b/src/predefine.ts
index 6fc8c0b..fe6b319 100644
--- a/src/predefine.ts
+++ b/src/predefine.ts
@@ -95,11 +95,12 @@ class Predefine {
 
   /**
    * Get current selected text.
+   * @param defaultText
    * @returns
    *  string: selected text
-   *  "" : if selected text contain illegal characters
+   *  defaultText : if selected text contain illegal characters or empty
    */
-  public selectedText(): string {
+  public selectedText(defaultText: string = ""): string {
     const selection = vscode.window.activeTextEditor.selection;
     const selectText =
       vscode.window.activeTextEditor.document.getText(selection);
@@ -108,8 +109,11 @@ class Predefine {
       vscode.window.showInformationMessage(
         "The selected text contains illegal characters that cannot be used as a file name!"
       );
-      return "";
+      return defaultText;
+    } else if (selectText.trim() == "") {
+      return defaultText;
     }
+
     return selectText;
   }
 }