diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index fca02e69f9..48352aa9c1 100755
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -24,6 +24,7 @@ For example when `attachable: false` is used with a modal, or if IE11/Edge is us
 - **List** - Fixed issue where `content` would not take up 100% width when used alongside `img` or `icon`
 - **Dropdown** - `inline dropdown` `close icon` default right margin default spacing slightly modified.
 - **Icon** - Fixes missing `disk outline icon` alias #6556
+- **Flag** - Add `uk` alias for `united kingdom` #6531
 
 ### Version 2.3.3 - July 8th, 2018
 
diff --git a/src/themes/default/elements/flag.overrides b/src/themes/default/elements/flag.overrides
index 20f5056eb1..6a0f9216c1 100644
--- a/src/themes/default/elements/flag.overrides
+++ b/src/themes/default/elements/flag.overrides
@@ -310,6 +310,7 @@ i.flag.gabon:before {
   background-position: -36px 0px;
 }
 i.flag.gb:before,
+i.flag.uk:before,
 i.flag.united.kingdom:before {
   background-position: -36px -26px;
 }