diff --git a/subjects/frontback/README.md b/subjects/frontback/README.md
index 0d1be400..b34d2b0b 100644
--- a/subjects/frontback/README.md
+++ b/subjects/frontback/README.md
@@ -12,7 +12,7 @@ Write a program that prints the previous letter and the next letter of the Latin
 ### Usage
 
 ```console
-$ go run . | cat -e 
+$ go run . | cat -e
 $
 $ go run . a | cat -e
 ab$