diff --git a/README.md b/README.md
index b95ff50de..12120c6a6 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@
 [![Crates.io](https://img.shields.io/crates/v/openraft.svg)](https://crates.io/crates/openraft)
 [![docs.rs](https://docs.rs/openraft/badge.svg)](https://docs.rs/openraft)
 [![guides](https://img.shields.io/badge/guide-%E2%86%97-brightgreen)](https://docs.rs/openraft/latest/openraft/docs/index.html)
+[![Discord Chat](https://img.shields.io/discord/1015845055434588200?logo=discord)](https://discord.gg/ZKw3WG7FQ9)
 <br/>
 [![CI](https://github.com/datafuselabs/openraft/actions/workflows/ci.yaml/badge.svg)](https://github.com/datafuselabs/openraft/actions/workflows/ci.yaml)
 ![License](https://img.shields.io/badge/license-MIT%2FApache--2.0-blue)
diff --git a/scripts/build_change_log.py b/scripts/build_change_log.py
index 53ef9acb3..5ccc70a03 100755
--- a/scripts/build_change_log.py
+++ b/scripts/build_change_log.py
@@ -246,11 +246,11 @@ def build_ver_changelog(new_ver, commit="HEAD", since=None):
         new_ver = new_ver.lstrip('v')
         new_ver = semantic_version.Version(new_ver)
         tags = [t for t in tags if t < new_ver]
-        latest = tags[-1]
+        latest = 'v' + str(tags[-1])
     else:
         latest = since
 
-    chs = changes('v' + str(latest), commit)
+    chs = changes(latest, commit)
     chs = norm_changes(chs)
 
     lines = []
@@ -340,7 +340,10 @@ def build_ver_changelog_summary(ver):
             l = re.sub('; \d\d\d\d-\d\d-\d\d$', '', l)
 
             # Remove suffix author
-            l = re.sub('; by [^ ]*$', '.', l)
+            l = re.sub('; by .*?$', '.', l)
+
+            # Remove redundent "."
+            l = re.sub('[.][.]$', '.', l)
 
             #   add indent:
             l = "    -   " + l
@@ -409,6 +412,8 @@ def load_cargo_version():
 if __name__ == "__main__":
     # Usage: to build change log from git log for the current version.
     # ./scripts/build_change_log.py
+    # ./scripts/build_change_log.py v0.8.3
+    # ./scripts/build_change_log.py 12345abc
 
     new_ver = load_cargo_version()