diff --git a/README.md b/README.md
index 3c6e273..6f98e13 100644
--- a/README.md
+++ b/README.md
@@ -429,6 +429,10 @@ Special worksheet keys (accessible as `worksheet[key]`, each starting with `!`):
   will write all cells in the merge range if they exist, so be sure that only
   the first cell (upper-left) in the range is set.
 
+- `ws['!rowBreaks']`: array of row break points, e.g. `[16,32]`
+- `ws['!colBreaks']`: array of col break points, e.g. `[8,16]`
+
+
 ### Workbook Object
 
 `workbook.SheetNames` is an ordered list of the sheets in the workbook
diff --git a/bits/67_wsxml.js b/bits/67_wsxml.js
index 937a14d..c5d1323 100644
--- a/bits/67_wsxml.js
+++ b/bits/67_wsxml.js
@@ -70,6 +70,17 @@ function write_ws_xml_merges(merges) {
 	return o + '</mergeCells>';
 }
 
+//<pageSetup scale="90" orientation="portrait" horizontalDpi="4294967292" verticalDpi="4294967292"/>
+//<rowBreaks count="1" manualBreakCount="1">
+// <brk id="8" max="16383" man="1"/>
+//</rowBreaks>
+//<colBreaks count="1" manualBreakCount="1">
+//    <brk id="8" max="1048575" man="1"/>
+//</colBreaks>
+
+
+
+
 function parse_ws_xml_hlinks(s, data, rels) {
 	for(var i = 0; i != data.length; ++i) {
 		var val = parsexmltag(data[i], true);
@@ -313,6 +324,30 @@ function write_ws_xml(idx, opts, wb) {
 
 	if(ws['!merges'] !== undefined && ws['!merges'].length > 0) o[o.length] = (write_ws_xml_merges(ws['!merges']));
 
+  if (ws['!rowBreaks'] !== undefined) o[o.length] =  write_ws_xml_row_breaks(ws['!rowBreaks'])
+  if (ws['!colBreaks'] !== undefined) o[o.length] =  write_ws_xml_col_breaks(ws['!colBreaks'])
+
 	if(o.length>2) { o[o.length] = ('</worksheet>'); o[1]=o[1].replace("/>",">"); }
 	return o.join("");
 }
+
+function write_ws_xml_row_breaks(breaks) {
+  console.log("Writing breaks")
+  var brk = [];
+  for (var i=0; i<breaks.length; i++) {
+    var thisBreak = ''+ (breaks[i]);
+    var nextBreak = '' + (breaks[i+1] || '16383');
+    brk.push(writextag('brk', null, {id: thisBreak, max: nextBreak, man: '1'}))
+  }
+  return writextag('rowBreaks', brk.join(' '), {count: brk.length, manualBreakCount: brk.length})
+}
+function write_ws_xml_col_breaks(breaks) {
+  console.log("Writing breaks");
+  var brk = [];
+  for (var i=0; i<breaks.length; i++) {
+    var thisBreak = ''+ (breaks[i]);
+    var nextBreak = '' + (breaks[i+1] || '16383');
+    brk.push(writextag('brk', null, {id: thisBreak, max: nextBreak, man: '1'}))
+  }
+  return writextag('colBreaks', brk.join(' '), {count: brk.length, manualBreakCount: brk.length})
+}
\ No newline at end of file
diff --git a/xlsx.js b/xlsx.js
index b0ff1eb..53fa59a 100644
--- a/xlsx.js
+++ b/xlsx.js
@@ -7595,6 +7595,17 @@ function write_ws_xml_merges(merges) {
 	return o + '</mergeCells>';
 }
 
+//<pageSetup scale="90" orientation="portrait" horizontalDpi="4294967292" verticalDpi="4294967292"/>
+//<rowBreaks count="1" manualBreakCount="1">
+// <brk id="8" max="16383" man="1"/>
+//</rowBreaks>
+//<colBreaks count="1" manualBreakCount="1">
+//    <brk id="8" max="1048575" man="1"/>
+//</colBreaks>
+
+
+
+
 function parse_ws_xml_hlinks(s, data, rels) {
 	for(var i = 0; i != data.length; ++i) {
 		var val = parsexmltag(data[i], true);
@@ -7838,10 +7849,33 @@ function write_ws_xml(idx, opts, wb) {
 
 	if(ws['!merges'] !== undefined && ws['!merges'].length > 0) o[o.length] = (write_ws_xml_merges(ws['!merges']));
 
+  if (ws['!rowBreaks'] !== undefined) o[o.length] =  write_ws_xml_row_breaks(ws['!rowBreaks'])
+  if (ws['!colBreaks'] !== undefined) o[o.length] =  write_ws_xml_col_breaks(ws['!colBreaks'])
+
 	if(o.length>2) { o[o.length] = ('</worksheet>'); o[1]=o[1].replace("/>",">"); }
 	return o.join("");
 }
 
+function write_ws_xml_row_breaks(breaks) {
+  console.log("Writing breaks")
+  var brk = [];
+  for (var i=0; i<breaks.length; i++) {
+    var thisBreak = ''+ (breaks[i]);
+    var nextBreak = '' + (breaks[i+1] || '16383');
+    brk.push(writextag('brk', null, {id: thisBreak, max: nextBreak, man: '1'}))
+  }
+  return writextag('rowBreaks', brk.join(' '), {count: brk.length, manualBreakCount: brk.length})
+}
+function write_ws_xml_col_breaks(breaks) {
+  console.log("Writing breaks");
+  var brk = [];
+  for (var i=0; i<breaks.length; i++) {
+    var thisBreak = ''+ (breaks[i]);
+    var nextBreak = '' + (breaks[i+1] || '16383');
+    brk.push(writextag('brk', null, {id: thisBreak, max: nextBreak, man: '1'}))
+  }
+  return writextag('colBreaks', brk.join(' '), {count: brk.length, manualBreakCount: brk.length})
+}
 /* [MS-XLSB] 2.4.718 BrtRowHdr */
 function parse_BrtRowHdr(data, length) {
 	var z = [];