diff --git a/Doc/lib/libbase64.tex b/Doc/lib/libbase64.tex
index dca25d0..a9c3bd1 100644
--- a/Doc/lib/libbase64.tex
+++ b/Doc/lib/libbase64.tex
@@ -4,7 +4,7 @@
 \indexii{base64}{encoding}
 \index{MIME!base64 encoding}
 
-This module perform base64 encoding and decoding of arbitrary binary
+This module performs base64 encoding and decoding of arbitrary binary
 strings into text strings that can be safely emailed or posted.  The
 encoding scheme is defined in \rfc{1421} (``Privacy Enhancement for
 Internet Electronic Mail: Part I: Message Encryption and