diff --git a/runtime/doc/spell.txt b/runtime/doc/spell.txt
index ae7789c..1504ea9 100644
--- a/runtime/doc/spell.txt
+++ b/runtime/doc/spell.txt
@@ -887,7 +887,7 @@
 generate a spell file for 'encoding'.  If some of the used characters to not
 fit in 'encoding' you will get an error message.
 							*spell-affix-mbyte*
-When using a multi-byte encoding it's possible to use more different affix
+When using a multibyte encoding it's possible to use more different affix
 flags.  But Myspell doesn't support that, thus you may not want to use it
 anyway.  For compatibility use an 8-bit encoding.