diff --git a/backend-api/alembic/versions/ccf7645372fc_add_manual_scan_result_detail_table.py b/backend-api/alembic/versions/ccf7645372fc_add_manual_scan_result_detail_table.py
new file mode 100644
index 000000000..daa053755
--- /dev/null
+++ b/backend-api/alembic/versions/ccf7645372fc_add_manual_scan_result_detail_table.py
@@ -0,0 +1,44 @@
+"""add manual_scan_result_detail table
+
+Revision ID: ccf7645372fc
+Revises: j1k2l3m4n567
+Create Date: 2026-04-13
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = "ccf7645372fc"
+down_revision: Union[str, Sequence[str], None] = "j1k2l3m4n567"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    op.create_table(
+        "manual_scan_result_detail",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("scan_result_id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("comment", sa.Text(), nullable=True),
+        sa.Column(
+            "created_at", sa.DateTime(), server_default=sa.text("now()"), nullable=False
+        ),
+        sa.Column(
+            "updated_at", sa.DateTime(), server_default=sa.text("now()"), nullable=False
+        ),
+        sa.ForeignKeyConstraint(["scan_result_id"], ["scan_result.id"], ondelete="CASCADE"),
+        sa.ForeignKeyConstraint(["user_id"], ["user.id"], ondelete="CASCADE"),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("scan_result_id"),
+    )
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    op.drop_table("manual_scan_result_detail")
\ No newline at end of file
diff --git a/backend-api/app/api/v1/manual_verification.py b/backend-api/app/api/v1/manual_verification.py
new file mode 100644
index 000000000..d80692972
--- /dev/null
+++ b/backend-api/app/api/v1/manual_verification.py
@@ -0,0 +1,166 @@
+"""Manual scan result detail API endpoints."""
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy import select
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.auth import get_current_user
+from app.db.session import get_async_session
+from app.models.compliance import Scan
+from app.models.manual_scan_result_detail import ManualScanResultDetail
+from app.models.scan_result import ScanResult
+from app.models.user import User
+from app.schemas.manual_scan_result_detail import (
+    ManualScanResultDetailCreate,
+    ManualScanResultDetailRead,
+    ManualScanResultDetailUpdate,
+)
+
+router = APIRouter(prefix="/manual-verification", tags=["Manual Verification"])
+
+
+def _check_ownership(detail: ManualScanResultDetail, user: User) -> None:
+    """Raise 403 if the current user does not own this record."""
+    if detail.user_id != user.id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="You do not have permission to access this record",
+        )
+
+
+@router.post("/", response_model=ManualScanResultDetailRead, status_code=status.HTTP_201_CREATED)
+async def create_manual_verification(
+    data: ManualScanResultDetailCreate,
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_async_session),
+):
+    """Submit a manual verification for a scan result."""
+    result = await db.execute(
+        select(ScanResult).where(ScanResult.id == data.scan_result_id)
+    )
+    scan_result = result.scalar_one_or_none()
+
+    if not scan_result:
+        raise HTTPException(status_code=404, detail="Scan result not found")
+
+    owner_result = await db.execute(
+        select(Scan).where(Scan.id == scan_result.scan_id)
+    )
+    scan = owner_result.scalar_one_or_none()
+
+    if not scan or scan.user_id != current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="You do not have permission to verify this scan result",
+        )
+
+    detail = ManualScanResultDetail(
+        scan_result_id=data.scan_result_id,
+        user_id=current_user.id,
+        comment=data.comment,
+    )
+
+    db.add(detail)
+
+    try:
+        await db.commit()
+    except IntegrityError:
+        await db.rollback()
+        raise HTTPException(
+            status_code=status.HTTP_409_CONFLICT,
+            detail="Manual verification already exists for this scan result",
+        )
+
+    await db.refresh(detail)
+    return detail
+
+
+@router.get("/{detail_id}", response_model=ManualScanResultDetailRead)
+async def get_manual_verification(
+    detail_id: int,
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_async_session),
+):
+    """Get a manual verification by ID."""
+    result = await db.execute(
+        select(ManualScanResultDetail).where(ManualScanResultDetail.id == detail_id)
+    )
+    detail = result.scalar_one_or_none()
+
+    if not detail:
+        raise HTTPException(status_code=404, detail="Manual verification not found")
+
+    _check_ownership(detail, current_user)
+    return detail
+
+
+@router.get("/by-scan-result/{scan_result_id}", response_model=ManualScanResultDetailRead)
+async def get_manual_verification_by_scan_result(
+    scan_result_id: int,
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_async_session),
+):
+    """Get a manual verification by scan result ID."""
+    result = await db.execute(
+        select(ManualScanResultDetail).where(
+            ManualScanResultDetail.scan_result_id == scan_result_id
+        )
+    )
+    detail = result.scalar_one_or_none()
+
+    if not detail:
+        raise HTTPException(
+            status_code=404,
+            detail="Manual verification not found for this scan result",
+        )
+
+    _check_ownership(detail, current_user)
+    return detail
+
+
+@router.patch("/{detail_id}", response_model=ManualScanResultDetailRead)
+async def update_manual_verification(
+    detail_id: int,
+    update: ManualScanResultDetailUpdate,
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_async_session),
+):
+    """Update a manual verification comment."""
+    result = await db.execute(
+        select(ManualScanResultDetail).where(ManualScanResultDetail.id == detail_id)
+    )
+    detail = result.scalar_one_or_none()
+
+    if not detail:
+        raise HTTPException(status_code=404, detail="Manual verification not found")
+
+    _check_ownership(detail, current_user)
+
+    if update.comment is not None:
+        detail.comment = update.comment
+
+    await db.commit()
+    await db.refresh(detail)
+    return detail
+
+
+@router.delete("/{detail_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_manual_verification(
+    detail_id: int,
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_async_session),
+):
+    """Delete a manual verification."""
+    result = await db.execute(
+        select(ManualScanResultDetail).where(ManualScanResultDetail.id == detail_id)
+    )
+    detail = result.scalar_one_or_none()
+
+    if not detail:
+        raise HTTPException(status_code=404, detail="Manual verification not found")
+
+    _check_ownership(detail, current_user)
+
+    await db.delete(detail)
+    await db.commit()
\ No newline at end of file
diff --git a/backend-api/app/api/v1/router.py b/backend-api/app/api/v1/router.py
index c648004af..6fb434d63 100644
--- a/backend-api/app/api/v1/router.py
+++ b/backend-api/app/api/v1/router.py
@@ -5,6 +5,7 @@
     contact,
     evidence,
     m365_connections,
+    manual_verification,
     platforms,
     scans,
     settings,
@@ -39,3 +40,6 @@
 
 # User settings routes
 api_router.include_router(settings.router)
+
+# Manual verification routes
+api_router.include_router(manual_verification.router)
diff --git a/backend-api/app/models/__init__.py b/backend-api/app/models/__init__.py
index 27c476e4d..d607c0777 100644
--- a/backend-api/app/models/__init__.py
+++ b/backend-api/app/models/__init__.py
@@ -8,6 +8,7 @@
 from app.models.aws_connection import AWSConnection
 from app.models.platform import Platform
 from app.models.scan_result import ScanResult
+from app.models.manual_scan_result_detail import ManualScanResultDetail
 from app.models.compliance import Scan
 from app.models.evidence_validation import EvidenceValidation
 from app.models.contact import ContactSubmission, SubmissionNote, SubmissionHistory
@@ -23,6 +24,7 @@
     "AWSConnection",
     "Platform",
     "ScanResult",
+    "ManualScanResultDetail",
     "Scan",
     "EvidenceValidation",
     "ContactSubmission",
diff --git a/backend-api/app/models/manual_scan_result_detail.py b/backend-api/app/models/manual_scan_result_detail.py
new file mode 100644
index 000000000..36b8d1319
--- /dev/null
+++ b/backend-api/app/models/manual_scan_result_detail.py
@@ -0,0 +1,38 @@
+"""ManualScanResultDetail model for extra data on manually verified controls."""
+
+from datetime import datetime
+from typing import TYPE_CHECKING, Optional
+
+from sqlalchemy import ForeignKey, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from sqlalchemy.sql import func
+
+from app.db.base import Base
+
+if TYPE_CHECKING:
+    from app.models.scan_result import ScanResult
+    from app.models.user import User
+
+
+class ManualScanResultDetail(Base):
+    """Extra detail for scan results that were manually verified."""
+
+    __tablename__ = "manual_scan_result_detail"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    scan_result_id: Mapped[int] = mapped_column(
+        ForeignKey("scan_result.id", ondelete="CASCADE"), nullable=False, unique=True
+    )
+    user_id: Mapped[int] = mapped_column(
+        ForeignKey("user.id", ondelete="CASCADE"), nullable=False
+    )
+    comment: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+
+    created_at: Mapped[datetime] = mapped_column(server_default=func.now(), nullable=False)
+    updated_at: Mapped[datetime] = mapped_column(
+        server_default=func.now(), onupdate=func.now(), nullable=False
+    )
+
+    # Relationships
+    scan_result: Mapped["ScanResult"] = relationship()
+    user: Mapped["User"] = relationship()
\ No newline at end of file
diff --git a/backend-api/app/schemas/__init__.py b/backend-api/app/schemas/__init__.py
index e6b5ceadc..d40134712 100644
--- a/backend-api/app/schemas/__init__.py
+++ b/backend-api/app/schemas/__init__.py
@@ -4,6 +4,11 @@
 from app.schemas.validator_match import ValidatorMatch
 from app.schemas.validator_result import ValidatorResult
 from app.schemas.validator_summary import ValidatorSummary
+from app.schemas.manual_scan_result_detail import (
+    ManualScanResultDetailCreate,
+    ManualScanResultDetailRead,
+    ManualScanResultDetailUpdate,
+)
 
 __all__ = [
     "UserRead",
@@ -13,4 +18,7 @@
     "ValidatorMatch",
     "ValidatorResult",
     "ValidatorSummary",
+    "ManualScanResultDetailCreate",
+    "ManualScanResultDetailRead",
+    "ManualScanResultDetailUpdate",
 ]
diff --git a/backend-api/app/schemas/manual_scan_result_detail.py b/backend-api/app/schemas/manual_scan_result_detail.py
new file mode 100644
index 000000000..29f5e66b3
--- /dev/null
+++ b/backend-api/app/schemas/manual_scan_result_detail.py
@@ -0,0 +1,31 @@
+"""Pydantic schemas for manual scan result detail."""
+
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict
+
+
+class ManualScanResultDetailCreate(BaseModel):
+    """Schema for creating a manual scan result detail."""
+
+    scan_result_id: int
+    comment: str | None = None
+
+
+class ManualScanResultDetailUpdate(BaseModel):
+    """Schema for updating a manual scan result detail."""
+
+    comment: str | None = None
+
+
+class ManualScanResultDetailRead(BaseModel):
+    """Schema for reading a manual scan result detail."""
+
+    id: int
+    scan_result_id: int
+    user_id: int
+    comment: str | None
+    created_at: datetime
+    updated_at: datetime
+
+    model_config = ConfigDict(from_attributes=True)
\ No newline at end of file
diff --git a/backend-api/tests/__init__.py b/backend-api/tests/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/backend-api/tests/test_manual_verification.py b/backend-api/tests/test_manual_verification.py
new file mode 100644
index 000000000..db33ed7ba
--- /dev/null
+++ b/backend-api/tests/test_manual_verification.py
@@ -0,0 +1,79 @@
+"""Integration tests for manual verification endpoints."""
+
+import os
+
+import httpx
+
+BASE = "http://localhost:8000/v1"
+
+
+def token():
+    r = httpx.post(
+        f"{BASE}/auth/login",
+        data={
+            "username": os.getenv(
+                "AUTOAUDIT_TEST_USERNAME",
+                "admin@example.com",
+            ),
+            "password": os.getenv(
+                "AUTOAUDIT_TEST_PASSWORD",
+                "admin",  # nosec B105
+            ),
+        },
+        timeout=10,
+    )
+
+    assert r.status_code == 200, r.text  # nosec B101
+
+    return r.json()["access_token"]
+
+
+def auth(token_value):
+    return {
+        "Authorization": f"Bearer {token_value}"
+    }
+
+
+def test_get_nonexistent_returns_404():
+    t = token()
+
+    r = httpx.get(
+        f"{BASE}/manual-verification/99999",
+        headers=auth(t),
+    )
+
+    assert r.status_code == 404, r.text  # nosec B101
+
+
+def test_patch_nonexistent_returns_404():
+    t = token()
+
+    r = httpx.patch(
+        f"{BASE}/manual-verification/99999",
+        json={"comment": "x"},
+        headers=auth(t),
+    )
+
+    assert r.status_code == 404, r.text  # nosec B101
+
+
+def test_delete_nonexistent_returns_404():
+    t = token()
+
+    r = httpx.delete(
+        f"{BASE}/manual-verification/99999",
+        headers=auth(t),
+    )
+
+    assert r.status_code == 404, r.text  # nosec B101
+
+
+def test_get_by_scan_result_nonexistent_returns_404():
+    t = token()
+
+    r = httpx.get(
+        f"{BASE}/manual-verification/by-scan-result/99999",
+        headers=auth(t),
+    )
+
+    assert r.status_code == 404, r.text  # nosec B101
\ No newline at end of file