diff --git a/lib/rules_block/heading.js b/lib/rules_block/heading.js
index 9b8eee4..d38e346 100644
--- a/lib/rules_block/heading.js
+++ b/lib/rules_block/heading.js
@@ -6,11 +6,13 @@ var isSpace = require('../common/utils').isSpace;
 
 
 module.exports = function heading(state, startLine, endLine, silent) {
-  var ch, level, tmp, token,
+  var ch, level, tmp, token, originalPos, originalMax,
       pos = state.bMarks[startLine] + state.tShift[startLine],
       max = state.eMarks[startLine];
 
   ch  = state.src.charCodeAt(pos);
+  originalPos = pos;
+  originalMax = max;
 
   if (ch !== 0x23/* # */ || pos >= max) { return false; }
 
@@ -39,14 +41,20 @@ module.exports = function heading(state, startLine, endLine, silent) {
   token        = state.push('heading_open', 'h' + String(level), 1);
   token.markup = '########'.slice(0, level);
   token.map    = [ startLine, state.line ];
+  token.position = originalPos;
+  token.size = pos - originalPos;
 
   token          = state.push('inline', '', 0);
   token.content  = state.src.slice(pos, max).trim();
   token.map      = [ startLine, state.line ];
   token.children = [];
+  token.position = pos;
+  token.size = max - pos;
 
   token        = state.push('heading_close', 'h' + String(level), -1);
   token.markup = '########'.slice(0, level);
+  token.position = max;
+  token.size = originalMax - max;
 
   return true;
 };
diff --git a/lib/token.js b/lib/token.js
index 448ff49..c644cd3 100644
--- a/lib/token.js
+++ b/lib/token.js
@@ -110,6 +110,20 @@ function Token(type, tag, nesting) {
    * to hide paragraphs.
    **/
   this.hidden   = false;
+
+  /**
+   * Token#position -> Number
+   *
+   * Position in the original string
+   **/
+  this.position     = 0;
+
+  /**
+   * Token#size -> Number
+   *
+   * Size of the token
+   **/
+  this.size     = 0;
 }