diff --git a/tsa/howto/letsencrypt.mdwn b/tsa/howto/letsencrypt.mdwn
index 8a6f6ffa5824f02dbc23804dcdd50c4d268fecf2..71f4ad43919166c9f1f9bb0aa77237d64508c9e3 100644
--- a/tsa/howto/letsencrypt.mdwn
+++ b/tsa/howto/letsencrypt.mdwn
@@ -1,6 +1,6 @@
 # How to get an X.509 certificate for your new name
 
-## The letnsencrypt-domains git repository
+## The letsencrypt-domains git repository
 
 If not already done, clone git repos letsencrypt-domains and
 backup-keys.