diff --git a/Doc/lib/libbz2.tex b/Doc/lib/libbz2.tex
index ea6f3ec..d836500 100644
--- a/Doc/lib/libbz2.tex
+++ b/Doc/lib/libbz2.tex
@@ -45,7 +45,7 @@
 it doesn't exist, and truncated otherwise. If \var{buffering} is given,
 \code{0} means unbuffered, and larger numbers specify the buffer size;
 the default is \code{0}. If
-\var{compresslevel} is given, must be a number between \code{1} and
+\var{compresslevel} is given, it must be a number between \code{1} and
 \code{9}; the default is \code{9}.
 Add a \character{U} to mode to open the file for input with universal newline
 support. Any line ending in the input file will be seen as a