diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index e757f3a6e..853e09c3e 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -1168,9 +1168,8 @@ void CMakeCommandUsage(const char* program)
     << "  remove_directory dir      - remove a directory and its contents\n"
     << "  rename oldname newname    - rename a file or directory "
        "(on one volume)\n"
-    << "  tar [cxt][vfz][cvfj] file.tar "
-    "file/dir1 file/dir2 ... - create a tar "
-    "archive\n"
+    << "  tar [cxt][vfz][cvfj] file.tar [file/dir1 file/dir2 ...]\n"
+    << "                            - create or extract a tar or zip archive\n"
     << "  time command [args] ...   - run command and return elapsed time\n"
     << "  touch file                - touch a file.\n"
     << "  touch_nocreate file       - touch a file but do not create it.\n"