diff --git a/example-dns-01-nsupdate-script.md b/example-dns-01-nsupdate-script.md
index a5f013c..ba3a013 100644
--- a/example-dns-01-nsupdate-script.md
+++ b/example-dns-01-nsupdate-script.md
@@ -32,7 +32,7 @@ case "$1" in
         # do nothing for now
         ;;
     *)
-        echo Unkown hook "${1}"
+        echo Unknown hook "${1}"
         exit 1
         ;;
 esac