diff --git a/lib/init.js b/lib/init.js
index c0cbc500..43f049e6 100644
--- a/lib/init.js
+++ b/lib/init.js
@@ -49,7 +49,7 @@ const initCommand = (baseDir, logger) => {
         });
 
       // update other keys
-      const keys = ["husky", "lint-staged", "remarkConfig"];
+      const keys = ["husky", "lint-staged", "prettier", "remarkConfig"];
       keys.forEach(key => {
         if (!(key in packageInfo)) {
           packageInfo[key] = {};
diff --git a/test/fixtures/package-empty_expected.json b/test/fixtures/package-empty_expected.json
index 64ada26b..f01ae76a 100644
--- a/test/fixtures/package-empty_expected.json
+++ b/test/fixtures/package-empty_expected.json
@@ -29,6 +29,9 @@
     },
     "ignore": ["CHANGELOG.md"]
   },
+  "prettier": {
+    "trailingComma": "es5"
+  },
   "remarkConfig": {
     "plugins": [
       "remark-preset-lint-markdown-style-guide",
diff --git a/test/fixtures/package-normal_expected.json b/test/fixtures/package-normal_expected.json
index 1d93034f..be88faad 100644
--- a/test/fixtures/package-normal_expected.json
+++ b/test/fixtures/package-normal_expected.json
@@ -30,6 +30,9 @@
     },
     "ignore": ["CHANGELOG.md"]
   },
+  "prettier": {
+    "trailingComma": "es5"
+  },
   "remarkConfig": {
     "plugins": [
       "remark-preset-lint-markdown-style-guide",