diff --git a/docs/changelog_3_1_0.rst b/docs/changelog_3_1_0.rst
index 2659888da..14a9e7ce3 100644
--- a/docs/changelog_3_1_0.rst
+++ b/docs/changelog_3_1_0.rst
@@ -35,8 +35,9 @@ Core
 
  * Delete cooldown messages when expired (`#2469`_)
  * ``[p]set locale`` now only accepts actual locales (`#2553`_)
- * ``[p]listlocales`` now displays en-US (`#2553`_)
+ * ``[p]listlocales`` now displays ``en-US`` (`#2553`_)
  * ``redbot --version`` will now give you current version of Red (`#2567`_)
+ * Default locale changed from ``en`` to ``en-US`` (`#2642`_)
 
 ------
 Config
@@ -148,3 +149,4 @@ Utility Functions
 .. _#2606: https://github.com/Cog-Creators/Red-DiscordBot/pull/2606
 .. _#2620: https://github.com/Cog-Creators/Red-DiscordBot/pull/2620
 .. _#2639: https://github.com/Cog-Creators/Red-DiscordBot/pull/2639
+.. _#2642: https://github.com/Cog-Creators/Red-DiscordBot/pull/2642
diff --git a/redbot/core/bot.py b/redbot/core/bot.py
index aba40f504..1f1f9d7d0 100644
--- a/redbot/core/bot.py
+++ b/redbot/core/bot.py
@@ -45,7 +45,7 @@ class RedBase(commands.GroupMixin, commands.bot.BotBase, RPCMixin):
             owner=None,
             whitelist=[],
             blacklist=[],
-            locale="en",
+            locale="en-US",
             embeds=True,
             color=15158332,
             fuzzy=False,