diff --git a/zlib.changes b/zlib.changes
index 751d607..039396d 100644
--- a/zlib.changes
+++ b/zlib.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Sep 24 20:21:46 UTC 2015 - jengelh@inai.de
+
+- Trim descriptions to fit target audience. Update RPM group
+  classification.
+
 -------------------------------------------------------------------
 Mon Jul 13 11:58:44 UTC 2015 - tchvatal@suse.com
 
diff --git a/zlib.spec b/zlib.spec
index f92409e..67a70d2 100644
--- a/zlib.spec
+++ b/zlib.spec
@@ -20,9 +20,9 @@
 Name:           zlib
 Version:        1.2.8
 Release:        0
-Summary:        Data Compression Library
+Summary:        Library implementing the DEFLATE compression algorithm
 License:        Zlib
-Group:          System/Libraries
+Group:          Development/Libraries/C and C++
 Url:            http://www.zlib.net/
 Source0:        http://zlib.net/zlib-%{version}.tar.gz
 Source1:        LICENSE
@@ -39,50 +39,59 @@ BuildRequires:  pkgconfig
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description
-zlib is designed to be a free, general-purpose, legally unencumbered -- that
-is, not covered by any patents -- lossless data-compression library for use on
-virtually any computer hardware and operating system. the zlib data format is
-itself portable across platforms. unlike the lzw compression method used in
-unix compress(1) and in the gif image format, the compression method currently
-used in zlib essentially never expands the data. (lzw can double or triple the
-file size in extreme cases.) zlib's memory footprint is also independent of the
-input data and can be reduced, if necessary, at some cost in compression.
+zlib is a general-purpose lossless data-compression library,
+implementing an API for the DEFLATE algorithm, the latter of
+which is being used by, for example, gzip and the ZIP archive
+format.
 
 %package -n libz1
-Summary:        Include Files and Libraries mandatory for Development
+Summary:        Library implementing the DEFLATE compression algorithm
 Group:          System/Libraries
 Provides:       %{name} = %{version}-%{release}
 Obsoletes:      %{name} < %{version}-%{release}
 
 %description -n libz1
-zlib is designed to be a free, general-purpose, legally unencumbered -- that
-is, not covered by any patents -- lossless data-compression library for use on
-virtually any computer hardware and operating system. the zlib data format is
-itself portable across platforms. unlike the lzw compression method used in
-unix compress(1) and in the gif image format, the compression method currently
-used in zlib essentially never expands the data. (lzw can double or triple the
-file size in extreme cases.) zlib's memory footprint is also independent of the
-input data and can be reduced, if necessary, at some cost in compression.
+zlib is a general-purpose lossless data-compression library,
+implementing an API for the DEFLATE algorithm, the latter of
+which is being used by, for example, gzip and the ZIP archive
+format.
 
 %package devel
-Summary:        Include Files and Libraries mandatory for Development
+Summary:        Development files for zlib, a data compression library
 Group:          Development/Languages/C and C++
 Requires:       glibc-devel
 Requires:       libz1 = %{version}
 
 %description devel
-This package contains all necessary include files and libraries needed
-to develop applications that require the provided includes and
-libraries.
+zlib is a general-purpose lossless data-compression library,
+implementing an API for the DEFLATE algorithm, the latter of
+which is being used by, for example, gzip and the ZIP archive
+format.
+
+This subpackage holds the development headers for the library.
+
+The zlib data format is itself portable across platforms. Unlike the
+LZW compression method used in unix compress(1) and in the GIF image
+format, the compression method currently used in zlib essentially
+never expands the data. (LZW can double or triple the file size in
+extreme cases.) zlib's memory footprint is also independent of the
+input data and can be reduced, if necessary, at some cost in
+compression.
 
 %package devel-static
-Summary:        Static lib for libz1 library
+Summary:        Static library for zlib
 Group:          Development/Languages/C and C++
 Requires:       %{name}-devel = %{version}
 Provides:       %{name}-devel:%{_libdir}/libz.a
 
 %description devel-static
-Static library for libz1 package, that is complementing the devel package
+zlib is a general-purpose lossless data-compression library,
+implementing an API for the DEFLATE algorithm, the latter of
+which is being used by, for example, gzip and the ZIP archive
+format.
+
+This subpackage contains the static version of the library
+used for development.
 
 %package -n libminizip1
 Summary:        Library for manipulation with .zip archives