diff --git a/data/langdb.yaml b/data/langdb.yaml
index 2d06f35..f67ffbe 100644
--- a/data/langdb.yaml
+++ b/data/langdb.yaml
@@ -551,6 +551,8 @@ rtlscripts:
 regiongroups:
  # Worldwide, international
   WW: 1
+ # Special languages. To be shown near Worldwide when relevant.
+  SP: 1
  # America
   AM: 2
  # Europe
diff --git a/i18n/en.json b/i18n/en.json
index 9722941..2aa84b4 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -7,6 +7,7 @@
 },
 "uls-select-language": "Select Language",
 "uls-region-WW": "Worldwide",
+"uls-region-SP": "Special",
 "uls-region-AM": "America",
 "uls-region-AF": "Africa",
 "uls-region-EU": "Europe",
@@ -15,7 +16,7 @@
 "uls-region-PA": "Pacific",
 "uls-no-results-found": "No results found",
 "uls-common-languages": "Common languages",
-"uls-no-results-suggestion-title": "You may be interested in:", 
+"uls-no-results-suggestion-title": "You may be interested in:",
 "uls-search-help": "You can search by language name, script name, ISO code of language or you can browse by region:",
 "uls-search-placeholder": "Language search"
 }
diff --git a/i18n/qqq.json b/i18n/qqq.json
index 0e0c2f5..3db0d33 100644
--- a/i18n/qqq.json
+++ b/i18n/qqq.json
@@ -7,6 +7,7 @@
 	},
 	"uls-select-language": "Language Selector Title",
 	"uls-region-WW": "Label for worldwide languages. They are languages spoken in multiple countries. Eg: English, French, Spanish etc. This label is used in the map region of ULS and as the title of section showing worldwide languages. Translation should not be descriptive.",
+	"uls-region-SP": "Label for the special languages section. This section may include special custom languages that can be added in run time. It's shown after the Worldwide section.",
 	"uls-region-AM": "Label for America",
 	"uls-region-AF": "Label for Africa",
 	"uls-region-EU": "Label for Europe",
@@ -18,4 +19,4 @@
 	"uls-no-results-suggestion-title": "Title for language suggestion in 'no results found' screen",
 	"uls-search-help": "Help text for searching. After this text, there will be a set of links for regions",
 	"uls-search-placeholder": "Placeholder text in search box"
-}
\ No newline at end of file
+}
diff --git a/src/jquery.uls.core.js b/src/jquery.uls.core.js
index c736b35..09f65ec 100644
--- a/src/jquery.uls.core.js
+++ b/src/jquery.uls.core.js
@@ -236,7 +236,8 @@
 				quickList: uls.options.quickList,
 				clickhandler: $.proxy( uls.select, uls ),
 				lazyload: uls.options.lazyload,
-				source: uls.$languageFilter
+				source: uls.$languageFilter,
+				showRegions: uls.options.showRegions
 			} ).data( 'lcd' );
 
 			uls.$languageFilter.languagefilter( {
@@ -366,7 +367,8 @@
 		searchAPI: null, // Language search API
 		languages: $.uls.data.getAutonyms(), // Languages to be used for ULS, default is all languages
 		quickList: null, // Array of language codes or function that returns such
-		lazyload: true // Lazy load the language list when scrolled.
+		lazyload: true, // Lazy load the language list when scrolled.
+		showRegions: ['WW', 'AM', 'EU', 'ME', 'AF', 'AS', 'PA']
 	};
 
 	// Define a dummy i18n function, if jquery.i18n not integrated.
diff --git a/src/jquery.uls.data.utils.js b/src/jquery.uls.data.utils.js
index ed28ba1..ab0b3d6 100644
--- a/src/jquery.uls.data.utils.js
+++ b/src/jquery.uls.data.utils.js
@@ -421,4 +421,38 @@
 	$.uls.data.getLanguagesInTerritory = function ( territory ) {
 		return $.uls.data.territories[territory];
 	};
+
+	/**
+	 * Adds a language in run time and sets its options as provided.
+	 * If the target option is provided, the language is defined as a redirect.
+	 * Other possible options are script, regions and autonym.
+	 *
+	 * @param code string New language code.
+	 * @param options Object Language properties.
+	 * @return list of language codes
+	 */
+	$.uls.data.addLanguage = function( code, options ) {
+		if ( options.target ) {
+			$.uls.data.languages[code] = [options.target];
+		} else {
+			$.uls.data.languages[code] = [options.script, options.regions, options.autonym];
+		}
+	};
+
+	/**
+	 * Removes a language from the langdb in run time.
+	 *
+	 * @param code string Language code to delete.
+	 * @return true if the language was removed, false otherwise.
+	 */
+	$.uls.data.deleteLanguage = function( code ) {
+		if ( $.uls.data.languages[code] ) {
+			delete $.uls.data.languages[code];
+
+			return true;
+		}
+
+		return false;
+	};
+
 } ( jQuery ) );
diff --git a/src/jquery.uls.lcd.js b/src/jquery.uls.lcd.js
index eff660e..9a654b5 100644
--- a/src/jquery.uls.lcd.js
+++ b/src/jquery.uls.lcd.js
@@ -147,7 +147,10 @@
 				$rowDiv.append( $ul );
 			}
 
-			$divRegionCode.show();
+			// Don't show the region unless it was enabled
+			if ( $.inArray( regionCode, this.options.showRegions ) > -1 ) {
+				$divRegionCode.show();
+			}
 
 			return $ul;
 		},
@@ -158,6 +161,7 @@
 				regions = {
 					// These are fallback text when i18n library not present
 					WW: 'Worldwide',
+					SP: 'Special',
 					AM: 'America',
 					EU: 'Europe',
 					ME: 'Middle East',
@@ -317,6 +321,7 @@
 
 	$.fn.lcd.defaults = {
 		languages: null,
+		showRegions: ['WW', 'AM', 'EU', 'ME', 'AF', 'AS', 'PA'],
 		lazyload: true
 	};
 
diff --git a/test/jquery.uls.test.js b/test/jquery.uls.test.js
index 1bc3f71..a00fb0e 100644
--- a/test/jquery.uls.test.js
+++ b/test/jquery.uls.test.js
@@ -89,7 +89,16 @@
 		assert.ok( $.fn.uls, "$.fn.uls is defined" );
 	} );
 
-	test( "-- $.uls.data testing", 41, function ( assert ) {
+	test( "-- $.uls.data testing", 45, function ( assert ) {
+		// Add a language in run time.
+		// This is done early to make sure that it doesn't break other functions.
+		$.uls.data.addLanguage( 'qqq', {
+			script: 'Latn',
+			regions: ['SP'],
+			autonym: 'Language documentation'
+		} );
+
+		assert.ok( $.uls.data.getAutonym( 'qqq' ), 'Language documentation', 'Language qqq was added with the correct autonym' );
 
 		assert.strictEqual( $.uls.data.isRedirect( 'sr-ec' ), 'sr-cyrl', "'sr-ec' is a redirect to 'sr-cyrl'" );
 		var autonyms = $.uls.data.getAutonyms();
@@ -166,14 +175,14 @@
 		);
 
 		assert.deepEqual( $.uls.data.getRegionsInGroup( 3 ), [
-			"EU", "ME", "AF"
-		], "regions in group 3 are selected correctly" );
+			'EU', 'ME', 'AF'
+		], 'regions in group 3 are selected correctly' );
 		assert.deepEqual( $.uls.data.getRegionsInGroup( 2 ), [
-			"AM"
-		], "regions in group 2 are selected correctly" );
+			'AM'
+		], 'regions in group 2 are selected correctly' );
 		assert.deepEqual( $.uls.data.getRegionsInGroup( 1 ), [
-			"WW"
-		], "regions in group 1 are selected correctly" );
+			'WW', 'SP'
+		], 'regions in group 1 are selected correctly' );
 
 		var languagesByScriptInAM = $.uls.data.getLanguagesByScriptInRegion( "AM" );
 		assert.deepEqual( languagesByScriptInAM['Cans'], [
@@ -204,8 +213,8 @@
 		], 'All languages in the Greek script found' );
 
 		assert.deepEqual( $.uls.data.getAllRegions(), [
-			"WW", "AM", "EU", "ME", "AF", "AS", "PA"
-		], "All regions found" );
+			'WW', 'SP', 'AM', 'EU', 'ME', 'AF', 'AS', 'PA'
+		], 'All regions found' );
 
 		// autonyms: gn: avañe'ẽ, de: deutsch, hu: magyar, fi: suomi
 		assert.deepEqual( ['de', 'fi', 'gn', 'hu'].sort( $.uls.data.sortByAutonym ), [
@@ -219,6 +228,10 @@
 
 		assert.ok( $.inArray( "sah", $.uls.data.getLanguagesInTerritory( "RU" ) )
 			> -1, "Sakha language is spoken in Russia" );
+
+		assert.ok( $.uls.data.deleteLanguage( 'qqq' ), 'Deleting language qqq, which was added earlier, returns true.' );
+		assert.strictEqual( $.uls.data.languages['qqq'], undefined, 'Data about qqq is undefined after being deleted.' );
+		assert.ok( !$.uls.data.deleteLanguage( 'qqr' ), 'Deleting language qqr, which was never added, returns false.' );
 	} );
 
 }( jQuery ) );