diff --git a/Shorewall/lib.common b/Shorewall/lib.common
index f623f1c53..1fa773069 100644
--- a/Shorewall/lib.common
+++ b/Shorewall/lib.common
@@ -21,7 +21,7 @@
 #	along with this program; if not, write to the Free Software
 #	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 #
-# The purpose of is library is to hold those functions used by both the CLI and by the
+# The purpose of this library is to hold those functions used by both the CLI and by the
 # generated firewall scripts. To avoid versioning issues, it is copied into generated
 # scripts rather than loaded at run-time.
 #