diff --git a/hx.hs b/hx.hs
index d33d1ef..1bcc64b 100644
--- a/hx.hs
+++ b/hx.hs
@@ -705,10 +705,10 @@ mainArgs _ = error $ unlines ["Unexpected arguments."
                              ,"hx hash256                                [0]"
                              ,""
                              ,"# HASH BASED MACs"
-                             ,"hx hmac-sha224 <KEY> [<HEX-NPUT>]         [0]"
-                             ,"hx hmac-sha256 <KEY> [<HEX-NPUT>]         [0]"
-                             ,"hx hmac-sha384 <KEY> [<HEX-NPUT>]         [0]"
-                             ,"hx hmac-sha512 <KEY> [<HEX-NPUT>]         [0]"
+                             ,"hx hmac-sha224 <KEY> [<HEX-INPUT>]        [0]"
+                             ,"hx hmac-sha256 <KEY> [<HEX-INPUT>]        [0]"
+                             ,"hx hmac-sha384 <KEY> [<HEX-INPUT>]        [0]"
+                             ,"hx hmac-sha512 <KEY> [<HEX-INPUT>]        [0]"
                              ,""
                              ,"[0]: Not available in sx"
                              ,"[1]: `hx showtx` is always using JSON output,"