diff --git a/codesniffer.ruleset.xml b/codesniffer.ruleset.xml
index 2d06727b..370904f2 100644
--- a/codesniffer.ruleset.xml
+++ b/codesniffer.ruleset.xml
@@ -2,6 +2,7 @@
 <ruleset name="WordPress Theme Coding Standards">
 	<!-- See https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-ruleset.xml -->
 	<!-- See https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/blob/develop/WordPress-Core/ruleset.xml -->
+	<!-- See https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/wiki/Customizable-sniff-properties -->
 
 	<!-- Set a description for this ruleset. -->
 	<description>A custom set of code standard rules to check for WordPress themes.</description>
@@ -13,6 +14,14 @@
 		<exclude name="PEAR.Functions.FunctionCallSignature.Indent" />
 	</rule>
 
+	<!-- Verify that the text_domain is set to the desired text-domain.
+		 Multiple valid text domains can be provided as a comma-delimited list. -->
+	<rule ref="WordPress.WP.I18n">
+		<properties>
+			<property name="text_domain" type="array" value="_s" />
+		</properties>
+	</rule>
+
 	<!-- Include sniffs for PHP cross-version compatibility. -->
 	<config name="testVersion" value="5.2-99.0"/>
 	<rule ref="PHPCompatibility"/>