diff --git a/include/tidyenum.h b/include/tidyenum.h
index f87de49..7ff8c14 100644
--- a/include/tidyenum.h
+++ b/include/tidyenum.h
@@ -796,6 +796,8 @@ typedef enum
   TidyAttr_BASEPROFILE,         /**< BASEPROFILE= */
   TidyAttr_CONTENTSCRIPTTYPE,   /**< CONTENTSCRIPTTYPE= */
   TidyAttr_CONTENTSTYLETYPE,    /**< CONTENTSTYLETYPE= */
+  /* MathML <math> attributes */
+  TidyAttr_DISPLAY,             /**< DISPLAY= (html5) */
 
   N_TIDY_ATTRIBS              /**< Must be last */
 } TidyAttrId;
diff --git a/src/attrdict.c b/src/attrdict.c
index d858b72..b9e070f 100644
--- a/src/attrdict.c
+++ b/src/attrdict.c
@@ -7755,6 +7755,7 @@ const AttrVersion TY_(W3CAttrsFor_MATHML)[] =  /* [i_a]2 */
   { TidyAttr_ALIGN,                 xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 },
   { TidyAttr_CLASS,                 xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 },
   { TidyAttr_DIR,                   xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 },
+  { TidyAttr_DISPLAY,               xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_ID,                    xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 },
   { TidyAttr_HEIGHT,                xxxx|HT32|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|HT50|XH50 },
   { TidyAttr_LANG,                  xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|xxxx|xxxx|HT50|XH50 },
diff --git a/src/attrs.c b/src/attrs.c
index d95099e..b0ab4c2 100644
--- a/src/attrs.c
+++ b/src/attrs.c
@@ -415,6 +415,7 @@ static const Attribute attribute_defs [] =
   { TidyAttr_CONTENTSCRIPTTYPE,        "contentscripttype",      CH_PCDATA    }, /* for <svg> */
   { TidyAttr_CONTENTSTYLETYPE,         "contentstyletype",       CH_PCDATA    }, /* for <svg> */
 #endif
+  { TidyAttr_DISPLAY,                  "display",                 CH_PCDATA   }, /* on MATH tag (html5) */
 
   /* this must be the final entry */
   { N_TIDY_ATTRIBS,             NULL,                    NULL         }