add hint that this package contains both the library and the frontend utility

libarchive/libarchive.spec

@@ -52,6 +52,7 @@ AutoReqProv:  no
     Libarchive is a programming library that can create and read several
     different streaming archive formats, including most popular TAR
     variants and several CPIO formats. It can also write SHAR archives.
+    The package contains a tar(1) compatible frontend, too.
 
 %track
     prog libarchive = {