diff --git a/build.js b/build.js
index eb0b3e2..af443dc 100644
--- a/build.js
+++ b/build.js
@@ -5,6 +5,7 @@ const path = require('path');
 const util = require('util');
 const postcss = require('postcss');
 const htmlminify = require('html-minifier-terser').minify;
+const childProcess = require('child_process');
 const utils = require('./src/utils.js');
 const assproc = require('./src/assproc.js');
 
@@ -102,6 +103,14 @@ const htmlMinifyOptions = {
         FUTAMI_URL: config.common_url,
         MAMI_URL: config.modern_url,
         AMI_URL: config.compat_url,
+        GIT_HASH: await (() => {
+            return new Promise((resolve, reject) => {
+                childProcess.exec('git log --pretty="%H" -n1 HEAD', (err, stdout) => {
+                    if(err) reject(err);
+                    else resolve(stdout.trim());
+                });
+            });
+        })(),
     };
 
     console.log('Ensuring assets directory exists...');
diff --git a/src/mami.js/ui/settings.jsx b/src/mami.js/ui/settings.jsx
index 68c01b3..1d54bfd 100644
--- a/src/mami.js/ui/settings.jsx
+++ b/src/mami.js/ui/settings.jsx
@@ -411,8 +411,8 @@ Umi.UI.Settings = (function() {
 
     const createCopyright = function() {
         return <div class="mami-copyright">
-            <a href="//patchii.net/flashii/mami" target="_blank">Mami</a> © <a href="//flash.moe" target="_blank">flash.moe</a><br/>
-            <a href="//railgun.sh/sockchat" target="_blank">Sock Chat documentation</a>
+            <a href="//patchii.net/flashii/mami" target="_blank">Mami</a> # <a href={`//patchii.net/flashii/mami/commit/${GIT_HASH}`} target="_blank">{GIT_HASH.substring(0, 7)}</a> © <a href="//flash.moe" target="_blank">flash.moe</a><br/>
+            <a href="//railgun.sh/sockchat" target="_blank">Sock Chat documentation</a><br/>
         </div>;
     };