diff --git a/files/ja/_redirects.txt b/files/ja/_redirects.txt
index 0e95a6258af62a..6cdb0b4bd18038 100644
--- a/files/ja/_redirects.txt
+++ b/files/ja/_redirects.txt
@@ -2271,6 +2271,7 @@
 /ja/docs/Mozilla/Add-ons/WebExtensions/ThunderbirdにおけるWebExtensionsによるアドイン開発	/ja/docs/Mozilla/Add-ons/WebExtensions/Developing_WebExtensions_for_Thunderbird
 /ja/docs/Mozilla/Add-ons/WebExtensions/Using_the_JavaScript_APIs	/ja/docs/Mozilla/Add-ons/WebExtensions/API
 /ja/docs/Mozilla/Add-ons/WebExtensions/Walkthrough	/ja/docs/Mozilla/Add-ons/WebExtensions/Your_second_WebExtension
+/ja/docs/Mozilla/Add-ons/WebExtensions/What_next_	/ja/docs/Mozilla/Add-ons/WebExtensions/What_next
 /ja/docs/Mozilla/Add-ons/WebExtensions/manifest.json/applications	/ja/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_specific_settings
 /ja/docs/Mozilla/Add-ons/WebExtensions/user_interface/Browser_action	/ja/docs/Mozilla/Add-ons/WebExtensions/user_interface/Toolbar_button
 /ja/docs/Mozilla/Add-ons/WebExtensions/デバッグ	https://extensionworkshop.com/documentation/develop/debugging/
diff --git a/files/ja/_wikihistory.json b/files/ja/_wikihistory.json
index 0f352f869f7a81..36568b634e5813 100644
--- a/files/ja/_wikihistory.json
+++ b/files/ja/_wikihistory.json
@@ -4598,7 +4598,7 @@
     "modified": "2020-02-22T10:39:55.799Z",
     "contributors": ["Uemmra3", "SphinxKnight", "meganetaaan", "hashedhyphen"]
   },
-  "Mozilla/Add-ons/WebExtensions/What_next_": {
+  "Mozilla/Add-ons/WebExtensions/What_next": {
     "modified": "2019-12-03T06:14:22.142Z",
     "contributors": ["Uemmra3", "dskmori", "karakol2017"]
   },
diff --git a/files/ja/mozilla/add-ons/webextensions/what_next_/index.md b/files/ja/mozilla/add-ons/webextensions/what_next/index.md
similarity index 98%
rename from files/ja/mozilla/add-ons/webextensions/what_next_/index.md
rename to files/ja/mozilla/add-ons/webextensions/what_next/index.md
index 6bbc870f4545e3..927b65f588d7e6 100644
--- a/files/ja/mozilla/add-ons/webextensions/what_next_/index.md
+++ b/files/ja/mozilla/add-ons/webextensions/what_next/index.md
@@ -1,6 +1,7 @@
 ---
 title: 次にどうするのか？
-slug: Mozilla/Add-ons/WebExtensions/What_next_
+slug: Mozilla/Add-ons/WebExtensions/What_next
+original_slug: Mozilla/Add-ons/WebExtensions/What_next_
 ---
 
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