diff --git a/README.md b/README.md
index 407589c..f7abc90 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 a [Marked.js](https://marked.js.org) custom extension for [Misskey-flavored Markdown](https://github.com/misskey-dev/mfm.js/blob/develop/docs/syntax.md).
 
 this is a reimplementation of [the original MFM parser](https://github.com/misskey-dev/mfm.js/blob/develop/docs/syntax.md), which was written from the ground up using PEG.js instead of as an extension of CommonMark, and therefore was not up to spec.
+this extension is mostly compatible with the original, except it only implements `$[tags]`. mentions, hashtags and the `search` markup are out of scope.
 
 ## usage
 
@@ -11,5 +12,5 @@ const markedMfm = require('marked-mfm')
 
 marked.use(markedMfm)
 marked.parse('$[x2 beeg text]')
-// <p><span class="_mfm_x2_" >beeg text</span></p>
+// <p><span class="mfm _mfm_x2_" >beeg text</span></p>
 ```
diff --git a/lib/index.umd.js b/lib/index.umd.js
index b4cea17..352f068 100644
--- a/lib/index.umd.js
+++ b/lib/index.umd.js
@@ -147,32 +147,6 @@
 
         return "$[" + token.tag + " " + this.parser.parseInline(token.tokens) + "]";
       }
-    }, {
-      name: 'mfmSearch',
-      level: 'inline',
-      start: function start(src) {
-        var _src$match2;
-
-        return (_src$match2 = src.match(/(?<=^|<br>).+ search(?=$|<br>)/)) == null ? void 0 : _src$match2.index;
-      },
-      tokenizer: function tokenizer(src, tokens) {
-        var rule = /^(?!.*<br>)(.+) search(?=$|<br>)/;
-        var match = rule.exec(src);
-
-        if (match) {
-          var token = {
-            type: 'mfmSearch',
-            raw: match[0],
-            query: match[1].trim(),
-            tokens: []
-          };
-          this.lexer.inline(token.text, token.tokens);
-          return token;
-        }
-      },
-      renderer: function renderer(token) {
-        return "<a href=\"https://google.com/search?q=" + token.query + "\" class=\"mfm _mfm_search_\">" + token.raw + "</a>";
-      }
     }]
   };
 
diff --git a/package.json b/package.json
index c7566f4..64bf474 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "marked-mfm",
-  "version": "0.3.2",
+  "version": "0.4.0",
   "description": "Marked.js extension for Misskey-flavored Markdown",
   "main": "./src/index.js",
   "browser": "./lib/index.umd.js",
diff --git a/src/index.js b/src/index.js
index c899aa3..f4d337b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -50,27 +50,5 @@ export default {
         return `$[${token.tag} ${this.parser.parseInline(token.tokens)}]`
       },
     },
-    {
-      name: 'mfmSearch',
-      level: 'inline',
-      start (src) { return src.match(/(?<=^|<br>).+ search(?=$|<br>)/)?.index },
-      tokenizer (src, tokens) {
-        const rule = /^(?!.*<br>)(.+) search(?=$|<br>)/
-        const match = rule.exec(src)
-        if (match) {
-          const token = {
-            type: 'mfmSearch',
-            raw: match[0],
-            query: match[1].trim(),
-            tokens: [],
-          }
-          this.lexer.inline(token.text, token.tokens)
-          return token
-        }
-      },
-      renderer (token) {
-        return `<a href="https://google.com/search?q=${token.query}" class="mfm _mfm_search_">${token.raw}</a>`
-      },
-    },
   ],
 }
diff --git a/test/index.test.js b/test/index.test.js
index 2b48178..35b11bf 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -41,9 +41,4 @@ describe('marked-mfm', () => {
     marked.use(markedMfm)
     expect(marked('$[spin.alternate,speed=0.5s test]')).toBe('<p><span class="mfm _mfm_spin_" data-alternate data-speed="0.5s">test</span></p>\n')
   })
-
-  test('search', () => {
-    marked.use(markedMfm)
-    expect(marked('syuilo thighs search')).toBe('<p><a href="https://google.com/search?q=syuilo thighs" class="mfm _mfm_search_">syuilo thighs search</a></p>\n')
-  })
 })