diff --git a/openspec/changes/upgrade-ppstructure-models/MODEL_CLEANUP.md b/openspec/changes/archive/2025-11-27-upgrade-ppstructure-models/MODEL_CLEANUP.md
similarity index 100%
rename from openspec/changes/upgrade-ppstructure-models/MODEL_CLEANUP.md
rename to openspec/changes/archive/2025-11-27-upgrade-ppstructure-models/MODEL_CLEANUP.md
diff --git a/openspec/changes/upgrade-ppstructure-models/proposal.md b/openspec/changes/archive/2025-11-27-upgrade-ppstructure-models/proposal.md
similarity index 100%
rename from openspec/changes/upgrade-ppstructure-models/proposal.md
rename to openspec/changes/archive/2025-11-27-upgrade-ppstructure-models/proposal.md
diff --git a/openspec/changes/upgrade-ppstructure-models/specs/ocr-processing/spec.md b/openspec/changes/archive/2025-11-27-upgrade-ppstructure-models/specs/ocr-processing/spec.md
similarity index 100%
rename from openspec/changes/upgrade-ppstructure-models/specs/ocr-processing/spec.md
rename to openspec/changes/archive/2025-11-27-upgrade-ppstructure-models/specs/ocr-processing/spec.md
diff --git a/openspec/changes/upgrade-ppstructure-models/tasks.md b/openspec/changes/archive/2025-11-27-upgrade-ppstructure-models/tasks.md
similarity index 100%
rename from openspec/changes/upgrade-ppstructure-models/tasks.md
rename to openspec/changes/archive/2025-11-27-upgrade-ppstructure-models/tasks.md
diff --git a/openspec/specs/ocr-processing/spec.md b/openspec/specs/ocr-processing/spec.md
index 8b9e5bd..db73fad 100644
--- a/openspec/specs/ocr-processing/spec.md
+++ b/openspec/specs/ocr-processing/spec.md
@@ -186,3 +186,12 @@ The frontend SHALL provide a simple, user-friendly interface for selecting layou
 - **THEN** layout model selection SHALL be shown ONLY when OCR track is selected or auto-detected
 - **AND** SHALL be hidden for Direct track (which does not use PP-StructureV3)
 
+### Requirement: Model Cache Cleanup
+
+The system SHALL provide documentation for cleaning up unused model caches to optimize storage space.
+
+#### Scenario: User wants to free disk space after model upgrade
+- **WHEN** the user has upgraded from older models (PP-DocLayout-S, SLANet) to newer models
+- **THEN** the documentation SHALL explain how to delete unused cached models from `~/.paddlex/official_models/`
+- **AND** list which model directories can be safely removed
+