diff --git a/config/_default/params.toml b/config/_default/params.toml
index a1e90d2..4fc396d 100644
--- a/config/_default/params.toml
+++ b/config/_default/params.toml
@@ -55,9 +55,9 @@ show_categories = true
 # announcement
 # announcement module: https://github.com/gethugothemes/hugo-modules/tree/master/components/announcement
 [announcement]
-enable = false
+enable = true
 expire_days = 7
-content = "Official February [Memos](/memos)"
+content = "Invite [someone](/memos/HMC-Memo-005-Invite-Tree.pdf) to our community chat."
 
 # seo meta data for OpenGraph / Twitter Card
 # seo module: https://github.com/gethugothemes/hugo-modules/tree/master/seo-tools/basic-seo
diff --git a/content/english/memos/index.md b/content/english/memos/index.md
index 736f8d3..3e6bb35 100644
--- a/content/english/memos/index.md
+++ b/content/english/memos/index.md
@@ -24,4 +24,8 @@ Memos are published once a month as PDF documents below.
 - [HMC Memo 003 - Server Admin](/memos/HMC-Memo-003-Server-Admin.pdf)
 - [HMC Memo 004 - Meetup Hosts](/memos/HMC-Memo-004-Meetup-Hosts.pdf)
 
+**March 2026**
+
+- [HMC Memo 005 - Invite Tree](/memos/HMC-Memo-005-Invite-Tree.pdf)
+
 Date of publication varies.
diff --git a/static/memos/HMC-Memo-005-Invite-Tree.pdf b/static/memos/HMC-Memo-005-Invite-Tree.pdf
new file mode 100644
index 0000000..46a8df5
Binary files /dev/null and b/static/memos/HMC-Memo-005-Invite-Tree.pdf differ