diff --git a/pmd-html/src/main/java/net/sourceforge/pmd/lang/html/HtmlLanguageModule.java b/pmd-html/src/main/java/net/sourceforge/pmd/lang/html/HtmlLanguageModule.java
index d3389fe55c..e9614c1e3e 100644
--- a/pmd-html/src/main/java/net/sourceforge/pmd/lang/html/HtmlLanguageModule.java
+++ b/pmd-html/src/main/java/net/sourceforge/pmd/lang/html/HtmlLanguageModule.java
@@ -13,7 +13,7 @@ public final class HtmlLanguageModule extends BaseLanguageModule {
     public static final String TERSE_NAME = "html";
 
     public HtmlLanguageModule() {
-        super(NAME, null, TERSE_NAME, "html");
+        super(NAME, null, TERSE_NAME, "html", "htm", "xhtml", "xht", "shtml");
         addDefaultVersion("", new HtmlHandler());
     }