typos only
diff --git a/Doc/libftplib.tex b/Doc/libftplib.tex
index 63cde96..3fda77a 100644
--- a/Doc/libftplib.tex
+++ b/Doc/libftplib.tex
@@ -7,7 +7,7 @@
\code{FTP} class implements the client side of the FTP protocol. You
can use this to write Python programs that perform a variety of
automated FTP jobs, such as mirroring other ftp servers. It is also
-used bu the module \code{urllib} to handle URLs that use FTP. For
+used by the module \code{urllib} to handle URLs that use FTP. For
more information on FTP (File Transfer Protocol), see Internet RFC
959.