diff --git a/editors/README.md b/editors/README.md
index 2c52659..9d41cb8 100644
--- a/editors/README.md
+++ b/editors/README.md
@@ -5,3 +5,11 @@
 1. Open an `idea` folder
 2. Add all files and folders to zip archive, e.g. `settings.zip`
 3. File -> Manage IDE Settings -> Import. Select your zip file.
+
+## Prism.js
+
+```javascript
+import Prism from 'prismjs';
+import definePrismOwnLang from './prismjs/own-language.js'
+definePrismOwnLang(Prism)
+```
diff --git a/editors/highlighjs/own.js b/editors/highlighjs/own.js
new file mode 100644
index 0000000..309ce06
--- /dev/null
+++ b/editors/highlighjs/own.js
@@ -0,0 +1,44 @@
+export default function(hljs) {
+  const STRING = {
+    className: 'string',
+    variants: [{
+      begin: '"', end: '"',
+      contains: [hljs.BACKSLASH_ESCAPE]
+    }]
+  };
+
+  const EXTENDED_LITERAL = {
+    className: 'literal',
+    variants: [{
+      begin: '`', end: '`',
+      illegal: '\\n'
+    }]
+  };
+
+  const METHOD = {
+    className: 'function',
+    beginKeywords: 'def',
+    end: /[:={\[(\n;]/,
+    excludeEnd: true,
+    contains: [{
+      className: 'title',
+      begin: /[^0-9\n\t "'(),.`{}\[\]:;][^\n\t "'(),.`{}\[\]:;]+|[^0-9\n\t "'(),.`{}\[\]:;=]/,
+      relevance: 0
+    }]
+  };
+
+  return {
+    keywords: {
+      literal: 'true false this null',
+      keyword: 'break class continue def else for if match print println return use while do case extract include'
+    },
+    contains: [
+      hljs.C_LINE_COMMENT_MODE,
+      hljs.C_BLOCK_COMMENT_MODE,
+      STRING,
+      EXTENDED_LITERAL,
+      METHOD,
+      hljs.C_NUMBER_MODE
+    ]
+  };
+};
\ No newline at end of file
diff --git a/editors/idea/filetypes/OwnLang.xml b/editors/idea/filetypes/OwnLang.xml
index 324962e..af5ab47 100644
--- a/editors/idea/filetypes/OwnLang.xml
+++ b/editors/idea/filetypes/OwnLang.xml
@@ -13,7 +13,7 @@
     </options>
     <keywords keywords="break;case;class;continue;def;do;else;extract;for;if;match;new;print;println;return;while" ignore_case="false" />
     <keywords2 keywords="echo;newarray;try" />
-    <keywords3 keywords="false;this;true" />
+    <keywords3 keywords="false;null;this;true" />
     <keywords4 keywords="include;use" />
   </highlighting>
   <extensionMap>
diff --git a/editors/prismjs/own-language.js b/editors/prismjs/own-language.js
new file mode 100644
index 0000000..d12c786
--- /dev/null
+++ b/editors/prismjs/own-language.js
@@ -0,0 +1,19 @@
+export default function(Prism) {
+  Prism.languages.own = Prism.languages.extend('clike', {
+    'string': {
+      pattern: /(^|[^\\])"(?:\\.|[^"\\])*"/,
+      lookbehind: true,
+      greedy: true
+    },
+    'keyword': /\b(?:break|case|class|continue|def|do|else|extract|for|if|include|match|new|print|println|return|while|use)\b/,
+    'function': {
+      pattern: /((?:^|\s)def\s*)([a-zA-Z_]\w*)?(?=\s*\()/g,
+      lookbehind: true
+    },
+    'operator': {
+      pattern: /(^|[^.])(?:<<=?|>>>?=?|->|--|\+\+|&&|\*\*|\|\||::|\.\.\.?|[?:~]|[-+*/%&|^!=<>]=?)/m,
+      lookbehind: true
+    },
+    'punctuation': /[{}[\];(),.:`]/
+  });
+}
\ No newline at end of file