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+# MarkdownTOC - 4.0.0
+
+---
+
+**NOTE: 4.0.0 may have "breaking changes"**
+
+If there is a problem in autolink feature, Please check your `MarkdownTOC.sublime-settings`.
+
+But please be assured. The change is very easy!
+
+Ref: [Upgrade Guide](https://github.com/naokazuterada/MarkdownTOC/releases/tag/4.0.0)
+
+## Upgrade Guide
+
+Please remove following "patterns" in "id_replacements".
+
+```json
+{
+  "id_replacements": [
+    {
+      "pattern": "[_*]{2}([^\\s])[_*]{2}",
+      "replacement": "\\1"
+    },
+    {
+      "pattern": "[_*]([^\\s])[_*]",
+      "replacement": "\\1"
+    }
+  ]
+}
+```
+
+You do not need to do anything else.
+
+---
+
+## Changes
+
+- Fix broking autolink when two or more _ (underscores) used in the title Ref: [#142](https://github.com/naokazuterada/MarkdownTOC/issues/142)
+- Remove duplicate id_replacement patterns in settings file