diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..20d0894
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,20 @@
+# Changelog
+
+All notable changes to this project are documented in this file.
+
+## 1.1.0 - 2026-04-10
+
+### Added
+
+- Hashtag tagging with the `HST` tag.
+- Regression tests for hashtag tagging and `ADR` tagging behavior.
+- Expanded documentation covering the tagset, CoNLL-U output examples, limitations, performance, and application contexts.
+
+### Changed
+
+- `ADR` is now emitted whenever a token matches the `@`-address pattern, regardless of existing POS values in the input.
+- Documentation examples were revised and anonymized for public release.
+
+## 1.0.0
+
+- Initial release.
diff --git a/package-lock.json b/package-lock.json
index 9d4a283..a3ee5e6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "conllu-cmc",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "conllu-cmc",
-      "version": "1.0.0",
+      "version": "1.1.0",
       "license": "BSD-2-Clause",
       "dependencies": {
         "command-line-args": "^5.2.1",
@@ -5379,4 +5379,4 @@
       }
     }
   }
-}
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index deb5d1c..e66ca85 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "conllu-cmc",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Reads CoNLL-U format from stdin and annotates emojis, emoticons, hashtags, URLs, email addresses, @addresses, and action words. Writes CoNLL-U format to stdout.",
   "main": "src/index.js",
   "bin": {
@@ -42,4 +42,4 @@
     "child_process": "^1.0.2",
     "jest": "^29.7.0"
   }
-}
+}
\ No newline at end of file