diff --git a/config/_default/params.toml b/config/_default/params.toml
index 69bbc28..6d093f8 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 = "Founder's Memo on [Real-Life Camaraderie](/memos/HMC-Memo-009-Build-Up-Friendships.pdf)"
+content = "We're Going Underground [Goodbye, Open Web](/memos/HMC-Memo-010-Going-Underground.pdf)"
 
 # 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 4d1d5a2..699338c 100644
--- a/content/english/memos/index.md
+++ b/content/english/memos/index.md
@@ -44,4 +44,16 @@ Memos are published once a month as PDF documents below.
 
 - [HMC Memo 009 - Build Up Friendships](/memos/HMC-Memo-009-Build-Up-Friendships.pdf)
 
+**August 2026**
+
+- NONE: TOO BUSY, see [HMC Memo 009](/memos/HMC-Memo-009-Build-Up-Friendships.pdf)
+
+**September 2026**
+
+- NONE: TOO BUSY, see [HMC Memo 009](/memos/HMC-Memo-009-Build-Up-Friendships.pdf)
+
+**October 2026**
+
+- [HMC Memo 010 - Going Underground](/memos/HMC-Memo-010-Going-Underground.pdf)
+
 Date of publication varies.
diff --git a/static/memos/HMC-Memo-010-Going-Underground.pdf b/static/memos/HMC-Memo-010-Going-Underground.pdf
new file mode 100644
index 0000000..787144a
Binary files /dev/null and b/static/memos/HMC-Memo-010-Going-Underground.pdf differ