diff --git a/Documentation.html b/Documentation.html
index d04bcf84e..d2386ea7c 100755
--- a/Documentation.html
+++ b/Documentation.html
@@ -380,7 +380,9 @@
         Sets here the complete url (with full path) to your phpMyAdmin version.
         E.g. <tt>http://www.your_web.net/path_to_your_phpMyAdmin_directory/</tt>.
         <br />
-        Don't forget the slash at the end of your url.
+        Don't forget the slash at the end of your url. The url must contain
+        characters that are valid for a url, and on some servers, the path
+        is case-sensitive.
         <br /><br />
         This setting can be dynamically completed. For example, you can try to
         use such a kind of code:
diff --git a/config.inc.php3 b/config.inc.php3
index b0655c06f..0ab707e31 100755
--- a/config.inc.php3
+++ b/config.inc.php3
@@ -29,6 +29,9 @@
  *
  * Complete the variable below with the full url ie
  *    http://www.your_web.net/path_to_your_phpMyAdmin_directory/
+ *
+ * It must contain characters that are valid for a URL, and the path is
+ * case sensitive on some Web servers, for example Unix-based servers.
  */
 $cfgPmaAbsoluteUri = '';