diff --git a/CHANGELOG.md b/CHANGELOG.md
index dee5f2403..f6fc18ced 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -106,6 +106,7 @@ Thankyou! -->
 7. Adds support for `suppress_checks` controls in attributes to allow tools to automatically validate conventions #1063
     * Updated several attributes that do not follow conventions to disable linting for them
 8. Added `credential_uid` as an Observable type - type_id: 19. #1137
+9. New Extension registration for US Gov #1140
 
 ## [v1.2.0] - April 23rd, 2024
 
diff --git a/extensions.md b/extensions.md
index ef3838d9d..44d2573cb 100644
--- a/extensions.md
+++ b/extensions.md
@@ -3,6 +3,7 @@ The purpose of this file is to keep track of and avoid collisions in Extension `
 
 | Caption     | Name     | UID | Notes |
 |-------------|----------|-----|-------|
+| US GOV      | usg1     | **990** | The USG-1 schema extension |
 | Cisco       | cisco    | **991** | The Cisco schema extension |
 | Sedara      | sedara   | **992** | The Sedara schema extension |
 | Sciber      | sciber   | **993** | The Sciber schema extension |