diff --git a/commands.md b/commands.md
index 62d47a7..eec28a8 100644
--- a/commands.md
+++ b/commands.md
@@ -9,5 +9,6 @@
 - pwd - shows the working directory
 - rm - deletes a file or directory
 - touch - creates a new file
+- update - looks for updates
 
 **Try to do type help [command] in the terminal to show more details**
diff --git a/commands/update.php b/commands/update.php
new file mode 100644
index 0000000..47114b9
--- /dev/null
+++ b/commands/update.php
@@ -0,0 +1,23 @@
+<?php
+function func($commands)
+{
+    $now_v = "v1.5";
+    if (sizeof($commands) == 1) {
+        $ch = curl_init();
+        curl_setopt($ch, CURLOPT_URL, 'https://api.github.com/repos/hanyixuanten/browser-terminal/releases/latest');
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($ch, CURLOPT_HTTPHEADER, ['User-Agent: PHP']);
+        $response = json_decode(curl_exec($ch), true);
+        curl_close($ch);
+        $latest_v = $response['tag_name'];
+        if ($latest_v == $now_v) {
+            file_put_contents("recent.txt", "This is the latest version.<br/>", FILE_APPEND);
+        } else {
+            file_put_contents("recent.txt", "There is a new version $latest_v, you are using $now_v <br/>", FILE_APPEND);
+            file_put_contents("recent.txt", "<a href='https://api.github.com/repos/hanyixuanten/browser-terminal/zipball/$latest_v' style='color: white;'>Download zip</a> <br/>", FILE_APPEND);
+            file_put_contents("recent.txt", "<a href='https://api.github.com/repos/hanyixuanten/browser-terminal/tarball/$latest_v' style='color: white;'>tar.gz</a> <br/>", FILE_APPEND);
+        }
+    } else {
+        file_put_contents("recent.txt", "Invalid number of arguments.<br/>", FILE_APPEND);
+    }
+}
\ No newline at end of file
diff --git a/commands/when_adding_a_new_command b/commands/when_adding_a_new_command
index f6e86b2..9fac52a 100644
--- a/commands/when_adding_a_new_command
+++ b/commands/when_adding_a_new_command
@@ -1,3 +1,5 @@
 write php
 write help.txt <command_name>.txt
-edit commands.md
\ No newline at end of file
+edit commands.md
+
+if new version: edit new_v in update.php
\ No newline at end of file
diff --git a/static/help/update.txt b/static/help/update.txt
new file mode 100644
index 0000000..86834b0
--- /dev/null
+++ b/static/help/update.txt
@@ -0,0 +1,2 @@
+update - looks for updates<br/>
+usage: update<br/>
\ No newline at end of file
diff --git a/static/terminal.php/help.txt b/static/terminal.php/help.txt
index 69d1f95..298576d 100644
--- a/static/terminal.php/help.txt
+++ b/static/terminal.php/help.txt
@@ -7,4 +7,5 @@ mkdir - creates a new directory<br/>
 pwd - shows the working directory<br/>
 rm - deletes a file or directory<br/>
 touch - creates a new file<br/>
+update - looks for updates<br/>
 type help [command] to show more details<br/>
\ No newline at end of file