diff --git a/Doc/lib/libpoplib.tex b/Doc/lib/libpoplib.tex
index 1df47e74ccd..7f3af4c79c8 100644
--- a/Doc/lib/libpoplib.tex
+++ b/Doc/lib/libpoplib.tex
@@ -13,7 +13,7 @@
 \indexii{POP3}{protocol}
 
 This module defines a class, \class{POP3}, which encapsulates a
-connection to an POP3 server and implements protocol as defined in
+connection to an POP3 server and implements the protocol as defined in
 \rfc{1725}.  The \class{POP3} class supports both the minimal and
 optional command sets.