diff --git a/mdx/_rules/check_future_1.xsl b/mdx/_rules/check_future_1.xsl
index 969be471..79a01dd2 100644
--- a/mdx/_rules/check_future_1.xsl
+++ b/mdx/_rules/check_future_1.xsl
@@ -30,4 +30,17 @@
 	-->
 	<xsl:import href="check_framework.xsl"/>
 
+	<!--
+		If an entity has mdui:UIInfo, then that must include at least an
+		mdui:DisplayName with an English name.
+	-->
+	<xsl:template match="mdui:UIInfo[not(mdui:DisplayName[@xml:lang='en'])]">
+		<xsl:call-template name="error">
+			<xsl:with-param name="m">
+				<xsl:text>mdui:UIInfo with no xml:lang='en' DisplayName</xsl:text>
+			</xsl:with-param>
+		</xsl:call-template>
+		
+	</xsl:template>
+	
 </xsl:stylesheet>