diff --git a/Repositories/statistics/includes/inc.html.cumulative_usage_country.es.php b/Repositories/statistics/includes/inc.html.cumulative_usage_country.es.php
index c81b27d..6cb712f 100755
--- a/Repositories/statistics/includes/inc.html.cumulative_usage_country.es.php
+++ b/Repositories/statistics/includes/inc.html.cumulative_usage_country.es.php
@@ -4,6 +4,8 @@
 
 <h3>Abstract views and document downloads by country (derived from IP address of query)</h3>
 
+<p><strong>Note:</strong> The country of origin is determined by matching the source IP address against a database of known IP address ranges. Due to the ever-changing nature of the Internet, this database can never be 100% complete or accurate, so a small number of downloads may be reported as being from the wrong country. The list of countries displayed below should therefore be considered indicative rather than definitive.</p>
+
 <?php
 $max_width=500;