diff --git a/README.md b/README.md
index e11be5a..21df4ef 100644
--- a/README.md
+++ b/README.md
@@ -1449,7 +1449,7 @@ $ sudo mkdir /mnt/public
 
 $ sudo mount /dev/sdb2 /mnt/public
 
-$ gpg --armor --export $KEYID | sudo tee /mnt/public/$KEYID-$(date %+F).txt
+$ gpg --armor --export $KEYID | sudo tee /mnt/public/$KEYID-$(date +%F).txt
 
 $ sudo umount /mnt/public
 ```