diff --git a/contrib/catalogs/html5/html5.dtd b/contrib/catalogs/html5/html5.dtd
index 2905daefa7..8bc3a1bcb3 100644
--- a/contrib/catalogs/html5/html5.dtd
+++ b/contrib/catalogs/html5/html5.dtd
@@ -285,7 +285,7 @@
 
 <!ENTITY % block
     "p | %heading; | div | %lists; | %blocktext; | fieldset | table |
-    header | footer | section | hgroup | nav | dialog | figure |
+    header | footer | section | hgroup | main | nav | dialog | figure |
     datagrid | canvas | audio | video | source | embed | keygen |
     progress | ruby">
 
@@ -1119,6 +1119,9 @@ several semantically related columns together.
 <!ELEMENT hgroup (#PCDATA)>
 <!ATTLIST hgroup %attrs;>
 
+<!ELEMENT main (#PCDATA)>
+<!ATTLIST main %attrs;>
+
 <!ELEMENT nav (#PCDATA)>
 <!ATTLIST nav %attrs;>
 
diff --git a/src/lint/koHTMLLinter.py b/src/lint/koHTMLLinter.py
index 6fd3720d03..c5f7591b6a 100644
--- a/src/lint/koHTMLLinter.py
+++ b/src/lint/koHTMLLinter.py
@@ -955,7 +955,7 @@ class KoHTML5TidyLinter(CommonTidyLinter):
 
     
     html5_tidy_argv_additions = [
-        "--new-blocklevel-tags", "section,header,footer,hgroup,nav,dialog,datalist,details,figcaption,figure,meter,output,progress",
+        "--new-blocklevel-tags", "section,header,footer,hgroup,main,nav,dialog,datalist,details,figcaption,figure,meter,output,progress",
         "--new-pre-tags", "article,aside,summary,mark",
         "--new-inline-tags", "video,audio,canvas,source,embed,ruby,rt,rp,keygen,menu,command,time",
     ]