---
type: "AIHallucinationFinding"
title: "In MAS Notice 637 (Amendment) 2024, what do the yellow-highlighted passages signify, and will they…"
citation_id: "RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q012-Opus47"
finding_uid: "SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012--opus-47-websearch"
question_uid: "SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012"
regulation_id: "SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025"
regulation_slug: "NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025"
regulation_title: "MAS Notice 637 (Amendment) 2025 — Risk Based Capital Adequacy Requirements for Banks Incorporated in Singapore"
regulator_short_code: "MAS"
regulatory_body_id: "MAS-SG-001"
jurisdiction_code: "SG"
j_level: "J3"
ai_subject: "claude-opus-4-7"
ai_subject_display: "Claude Opus 4.7 (web search on)"
ai_subject_version: "opus-47-websearch"
response_failure_mode: "inference_drift"
substrate_document_name: "mas-notice-637-amendment-2025.pdf"
substrate_document_path: "https://reglegbrief.com/substrate/SG/MAS/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025/_raw_manual_substrate/mas-notice-637-amendment-2025.pdf"
substrate_section_anchor: "MAS Notice 637 (Amendment) 2025, Paragraph 3(c)"
citation_issue_types: []
audiences: ["ai_labs", "practitioners", "sector_dept"]
published_at: "2026-05-28T10:00:04.800870+00:00"
substrate_version: 1
methodology_version: "2.1"
license: "CC-BY-4.0"
resource: "https://reglegbrief.com/regulators/j3/sg/mas/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025/ai-labs/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012--opus-47-websearch/"
tags: ["ai-hallucination", "inference_drift", "mas", "notice-637-capital-adequacy-banks-2025", "sg"]
timestamp: "2026-06-16T00:00:00+00:00"
---

# AI Hallucination Finding: In MAS Notice 637 (Amendment) 2024, what do the yellow-highlighted passages signify, and will they…

- **Citation ID.** `RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q012-Opus47`
- **Finding UID.** `SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012--opus-47-websearch`
- **Regulation.** [`NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025`](/okf/regulations/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025.md) — MAS Notice 637 (Amendment) 2025 — Risk Based Capital Adequacy Requirements for Banks Incorporated in Singapore
- **Regulator.** [`MAS-SG-001`](/okf/bodies/MAS-SG-001.md) — Monetary Authority of Singapore
- **AI subject.** Claude Opus 4.7 (web search on)
- **Failure mode.** [`inference_drift`](/okf/taxonomy/failure-modes.md)
- **Published.** 2026-05-28T10:00:04.800870+00:00

## Question put to the AI subject

In MAS Notice 637 (Amendment) 2024, what do the yellow-highlighted passages signify, and will they appear in the final consolidated version of the Notice?

## AI subject's verbatim answer

Yellow highlighting in MAS tracked-change amendment PDFs is typically used as a drafting/visual aid to draw attention to particular text — for example, defined terms, cross-references, or items the reader should pay particular attention to during review.

## Verbatim regulator text contradicting the answer

> Text which is highlighted in yellow are annotations to describe changes, and will not appear in the published untracked version of MAS Notice 637. For instance, where amendments have been made to a selected paragraph of an Annex, only that paragraph will be reflected in this document, prefaced with the following explanatory text in yellow highlights: [Amendments to paragraph xx].

_Source:_ [mas-notice-637-amendment-2025.pdf](https://reglegbrief.com/substrate/SG/MAS/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025/_raw_manual_substrate/mas-notice-637-amendment-2025.pdf)
_Section anchor:_ MAS Notice 637 (Amendment) 2025, Paragraph 3(c)

## Failure mode

**`inference_drift`** — Inference drift — the AI inferred a conclusion the regulator's text does not warrant, often by combining unrelated provisions.

## Related concepts

- Regulation: [NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025](/okf/regulations/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025.md)
- Regulator: [MAS-SG-001](/okf/bodies/MAS-SG-001.md)
- Failure-mode taxonomy: [inference_drift](/okf/taxonomy/failure-modes.md)
- Methodology: [v2.3](/okf/methodology.md)
- Editorial standards: [right of reply](/okf/editorial-standards.md)

## Reproduction

Citation ID: `RLB-H-SG-MAS-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-Q012-Opus47`

Resource URL (HTML view of this finding):

<https://reglegbrief.com/regulators/j3/sg/mas/NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025/ai-labs/finding/SG-MAS-SG-001-NOTICE-637-CAPITAL-ADEQUACY-BANKS-2025-v1-012--opus-47-websearch/>

This finding is reproducible against the substrate document linked above, using the same AI subject, the same methodology version, and the verbatim question text.