diff --git a/helper.ts b/helper.ts
index ef0c742..dad4ba0 100644
--- a/helper.ts
+++ b/helper.ts
@@ -3,6 +3,7 @@ import { join } from 'node:path'
 import { it } from 'avait'
 import Bun from 'bun'
 import { create } from 'logua'
+import { parse } from 'parse-gitignore'
 import { z } from 'zod'
 import { configurations, ignore } from './configuration'
 import { state } from './state'
@@ -42,6 +43,23 @@ export async function findConfiguration() {
   state.options = userConfiguration
 }
 
+async function addAdditionalGitignoreEntries(file: { name: string; contents: string }) {
+  const addedIgnores: string[] = []
+  const existingFileContents = await Bun.file(file.name).text()
+  const { patterns: existingIgnores } = parse(existingFileContents)
+  const { patterns: updatedIgnores } = parse(file.contents)
+
+  for (const pattern of updatedIgnores) {
+    if (!(existingIgnores.includes(pattern) || existingIgnores.includes(`!${pattern}`))) {
+      addedIgnores.push(pattern)
+    }
+  }
+
+  if (addedIgnores.length) {
+    await Bun.write(file.name, `${existingFileContents}${existingFileContents.endsWith('\n') ? '' : '\n'}${addedIgnores.join('\n')}\n`)
+  }
+}
+
 export async function writeGitIgnore(ignores: string[]) {
   let userIgnores = state.options.ignore ?? state.options.gitignore ?? []
 
@@ -53,8 +71,11 @@ export async function writeGitIgnore(ignores: string[]) {
     userIgnores.push(...ignores)
   }
 
-  if (!existsSync('./.gitignore')) {
-    const file = ignore.createFile(userIgnores as string[])
+  const file = ignore.createFile(userIgnores as string[])
+
+  if (existsSync(file.name)) {
+    await addAdditionalGitignoreEntries(file)
+  } else {
     await Bun.write(file.name, file.contents)
   }
 }
diff --git a/index.ts b/index.ts
index 9d7eb27..0b3fdf8 100644
--- a/index.ts
+++ b/index.ts
@@ -7,7 +7,7 @@ import { state } from './state'
 
 const ignores: string[] = []
 
-findConfiguration()
+await findConfiguration()
 
 for (const { name, alias, configuration } of configurations) {
   const value = state.options[name] ?? (alias && state.options[alias])
diff --git a/package.json b/package.json
index 66fd205..70fb8c7 100644
--- a/package.json
+++ b/package.json
@@ -14,11 +14,13 @@
   "dependencies": {
     "avait": "^1.0.0",
     "logua": "^3.0.3",
+    "parse-gitignore": "^2.0.0",
     "zod": "^3.22.5"
   },
   "devDependencies": {
     "@biomejs/biome": "^1.7.0",
     "@types/bun": "^1.1.0",
+    "@types/parse-gitignore": "^1.0.2",
     "eslint-config-airbnb": "^19.0.4",
     "typescript": "^5.4.5"
   },
@@ -29,7 +31,8 @@
   "bin": "./index.ts",
   "files": [
     "*.ts",
-    "configuration"
+    "configuration",
+    "*.md"
   ],
   "keywords": [
     "configuration",
@@ -48,6 +51,7 @@
       "!test/fixture/*/package.json",
       "!test/fixture/*/configuration.ts"
     ],
+    "license": "MIT",
     "biome": "recommended",
     "vscode": "recommended",
     "typescript": {