diff --git a/theme/upgrade.txt b/theme/upgrade.txt
index 22941d79ea1..e0af22610d7 100644
--- a/theme/upgrade.txt
+++ b/theme/upgrade.txt
@@ -2,7 +2,7 @@ This files describes API changes in /theme/* themes,
 information provided here is intended especially for theme designer.
 
 === 4.0 ===
-* The Bootstrap legacy css utilities from Bootstrap 2 and 4alpha have been removed. 
+* The Bootstrap legacy css utilities from Bootstrap 2 and 4alpha have been removed.
 The syntax for the new Bootstrap 4.5 utility classes is {property}{sides}-{breakpoint}-{size} for sm, md, lg, and xl.
 The size values are:
 1: 0.25rem