diff --git a/docs/changelog-claude.md b/docs/changelog-claude.md
index d41ad62..0239589 100644
--- a/docs/changelog-claude.md
+++ b/docs/changelog-claude.md
@@ -4,6 +4,11 @@ This file documents all changes made to this project via Claude Code.
 
 ## [2026-02-05]
 
+### Fixed
+- Autotask ticket resolution update now correctly handles tickets where `issueType`, `subIssueType`,
+  or `source` fields are not set (value 0 or null). These picklist fields now default to 0 when
+  null/missing in GET response. Only `id` and `status` are truly required with real values.
+
 ### Added
 - Restored Autotask PSA integration from branch `v20260203-13-autotask-resolution-item-wrapper`:
   - `integrations/autotask/client.py` - Autotask REST API client with full support for: