diff --git a/Doc/lib/libzlib.tex b/Doc/lib/libzlib.tex
index d5dab91f22f..ab30a324982 100644
--- a/Doc/lib/libzlib.tex
+++ b/Doc/lib/libzlib.tex
@@ -27,7 +27,7 @@ Compresses the data in \var{string}, returning a string contained
 compressed data.  \var{level} is an integer from 1 to 9 controlling
 the level of compression; 1 is fastest and produces the least
 compression, 9 is slowest and produces the most.  The default value is
-6, which .  Raises the \code{zlib.error} exception if any error occurs.
+6.  Raises the \code{zlib.error} exception if any error occurs.
 \end{funcdesc}
 
 \begin{funcdesc}{compressobj}{\optional{level}}
diff --git a/Doc/libzlib.tex b/Doc/libzlib.tex
index d5dab91f22f..ab30a324982 100644
--- a/Doc/libzlib.tex
+++ b/Doc/libzlib.tex
@@ -27,7 +27,7 @@ Compresses the data in \var{string}, returning a string contained
 compressed data.  \var{level} is an integer from 1 to 9 controlling
 the level of compression; 1 is fastest and produces the least
 compression, 9 is slowest and produces the most.  The default value is
-6, which .  Raises the \code{zlib.error} exception if any error occurs.
+6.  Raises the \code{zlib.error} exception if any error occurs.
 \end{funcdesc}
 
 \begin{funcdesc}{compressobj}{\optional{level}}