--- a/readme.rst	Thu Sep 05 03:59:23 2013 -0400
+++ b/readme.rst	Thu Sep 05 04:07:37 2013 -0400
@@ -11,7 +11,7 @@
 
 - **infernal** >= 1.1rc4 is an optional dependency to find non-coding RNAs. An executable is shipped with prokka.
 - **SignalP** >= 3.0 is an optional dependency to find signal peptides. For licensing reasons, no automatic dependency is managed.
-- **tbl2asn** >= 21.0 is required. This dependency is not managed here. The reason is that versions are increasing very rapidly. The software can be downloaded from the NCBI (ftp) at the following address.
+- **tbl2asn** >= 21.0 is required. This dependency is not managed here. The reason is that versions are increasing very rapidly. The software can be downloaded from the `NCBI ftp site`_
 ftp://ftp.ncbi.nih.gov/toolbox/ncbi_tools/converters/by_program/tbl2asn/
 - **BioPerl** >= 1.6 is required, but the dependency is not managed here, although it might in future. 
 - **GNU Parallel** >= 20120322 is required but is shipped with Prokka and thus is not managed by the tool dependency system
@@ -33,3 +33,5 @@
 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License along with this program.  If not, see http://www.gnu.org/licenses/.
+
+.. _`NCBI ftp site`://ftp.ncbi.nih.gov/toolbox/ncbi_tools/converters/by_program/tbl2asn/