--- a/check_rbl/src/check_rbl.pod
+++ b/check_rbl/src/check_rbl.pod
@@ -58,7 +58,7 @@ the querying mechanism.
 =head1 EXIT STATUS
 
 0 if OK, 1 in case of a warning, 2 in case of a critical status and 3
-in case of an unkown problem
+in case of an unknown problem
 
 =head1 DEPENDENCIES
 
