diff --git a/Doc/lib/libzlib.tex b/Doc/lib/libzlib.tex
index 1da7f783523..2c99fb45f0d 100644
--- a/Doc/lib/libzlib.tex
+++ b/Doc/lib/libzlib.tex
@@ -87,7 +87,7 @@ default size is 16384.
 \end{funcdesc}
 
 \begin{funcdesc}{decompressobj}{\optional{wbits}}
-  Returns a compression object, to be used for decompressing data
+  Returns a decompression object, to be used for decompressing data
   streams that won't fit into memory at once.  The \var{wbits}
   parameter controls the size of the window buffer.
 \end{funcdesc}