diff --git a/Examples/39dropdown.php b/Examples/39dropdown.php
index c8e6b1b..5dadc09 100644
--- a/Examples/39dropdown.php
+++ b/Examples/39dropdown.php
@@ -61,6 +61,7 @@ function transpose($value) {
 $continentColumn = 'D';
 $column = 'F';
 
+// Set data for dropdowns
 foreach(glob('./data/continents/*') as $key => $filename) {
     $continent = pathinfo($filename, PATHINFO_FILENAME);
     echo "Loading $continent", EOL;
@@ -87,6 +88,8 @@ foreach(glob('./data/continents/*') as $key => $filename) {
 
     ++$column;
 }
+
+// Hide the dropdown data
 $objPHPExcel->getActiveSheet()
     ->getColumnDimension($continentColumn)
     ->setVisible(false);
@@ -99,6 +102,7 @@ $objPHPExcel->addNamedRange(
 );
 
 
+// Set selection cells
 $objPHPExcel->getActiveSheet()
     ->setCellValue('A1', 'Continent:');
 $objPHPExcel->getActiveSheet()
@@ -111,6 +115,7 @@ $objPHPExcel->getActiveSheet()
     ->getStyle('A1:A3')
     ->getFont()->setBold(true);
 
+// Set linked validators
 $objValidation = $objPHPExcel->getActiveSheet()
     ->getCell('B1')
     ->getDataValidation();
diff --git a/Examples/data/continents/Africa.txt b/Examples/data/continents/Africa.txt
new file mode 100644
index 0000000..407fa76
--- /dev/null
+++ b/Examples/data/continents/Africa.txt
@@ -0,0 +1,54 @@
+Algeria
+Angola
+Benin
+Botswana
+Burkina
+Burundi
+Cameroon
+Cape Verde
+Central African Republic
+Chad
+Comoros
+Congo
+Congo, Democratic Republic of
+Djibouti
+Egypt
+Equatorial Guinea
+Eritrea
+Ethiopia
+Gabon
+Gambia
+Ghana
+Guinea
+Guinea-Bissau
+Ivory Coast
+Kenya
+Lesotho
+Liberia
+Libya
+Madagascar
+Malawi
+Mali
+Mauritania
+Mauritius
+Morocco
+Mozambique
+Namibia
+Niger
+Nigeria
+Rwanda
+Sao Tome and Principe 
+Senegal
+Seychelles
+Sierra Leone
+Somalia
+South Africa
+South Sudan
+Sudan
+Swaziland
+Tanzania
+Togo
+Tunisia
+Uganda
+Zambia
+Zimbabwe
diff --git a/Examples/data/continents/Asia.txt b/Examples/data/continents/Asia.txt
new file mode 100644
index 0000000..9ce006c
--- /dev/null
+++ b/Examples/data/continents/Asia.txt
@@ -0,0 +1,44 @@
+Afghanistan
+Bahrain
+Bangladesh
+Bhutan
+Brunei
+Burma (Myanmar)
+Cambodia
+China
+East Timor
+India
+Indonesia
+Iran
+Iraq
+Israel
+Japan
+Jordan
+Kazakhstan
+Korea, North
+Korea, South
+Kuwait
+Kyrgyzstan
+Laos
+Lebanon
+Malaysia
+Maldives
+Mongolia
+Nepal
+Oman
+Pakistan
+Philippines
+Qatar
+Russian Federation
+Saudi Arabia
+Singapore
+Sri Lanka
+Syria
+Tajikistan
+Thailand
+Turkey
+Turkmenistan
+United Arab Emirates
+Uzbekistan
+Vietnam
+Yemen
diff --git a/Examples/data/continents/Europe.txt b/Examples/data/continents/Europe.txt
new file mode 100644
index 0000000..70c1160
--- /dev/null
+++ b/Examples/data/continents/Europe.txt
@@ -0,0 +1,47 @@
+Albania
+Andorra
+Armenia
+Austria
+Azerbaijan
+Belarus
+Belgium
+Bosnia and Herzegovina
+Bulgaria
+Croatia
+Cyprus
+Czech Republic
+Denmark
+Estonia
+Finland
+France
+Georgia
+Germany
+Greece
+Hungary
+Iceland
+Ireland
+Italy
+Latvia
+Liechtenstein
+Lithuania
+Luxembourg
+Macedonia
+Malta
+Moldova
+Monaco
+Montenegro
+Netherlands
+Norway
+Poland
+Portugal
+Romania
+San Marino
+Serbia
+Slovakia
+Slovenia
+Spain
+Sweden
+Switzerland
+Ukraine
+United Kingdom
+Vatican City
diff --git a/Examples/data/continents/North America.txt b/Examples/data/continents/North America.txt
new file mode 100644
index 0000000..5881ae1
--- /dev/null
+++ b/Examples/data/continents/North America.txt	
@@ -0,0 +1,23 @@
+Antigua and Barbuda
+Bahamas
+Barbados
+Belize
+Canada
+Costa Rica
+Cuba
+Dominica
+Dominican Republic
+El Salvador
+Grenada
+Guatemala
+Haiti
+Honduras
+Jamaica
+Mexico
+Nicaragua
+Panama
+Saint Kitts and Nevis
+Saint Lucia
+Saint Vincent and the Grenadines
+Trinidad and Tobago
+United States
diff --git a/Examples/data/continents/Oceania.txt b/Examples/data/continents/Oceania.txt
new file mode 100644
index 0000000..cbdc896
--- /dev/null
+++ b/Examples/data/continents/Oceania.txt
@@ -0,0 +1,14 @@
+Australia
+Fiji
+Kiribati
+Marshall Islands
+Micronesia
+Nauru
+New Zealand
+Palau
+Papua New Guinea
+Samoa
+Solomon Islands
+Tonga
+Tuvalu
+Vanuatu
diff --git a/Examples/data/continents/South America.txt b/Examples/data/continents/South America.txt
new file mode 100644
index 0000000..777ffbf
--- /dev/null
+++ b/Examples/data/continents/South America.txt	
@@ -0,0 +1,12 @@
+Argentina
+Bolivia
+Brazil
+Chile
+Colombia
+Ecuador
+Guyana
+Paraguay
+Peru
+Suriname
+Uruguay
+Venezuela