diff --git a/CHANGELOG.md b/CHANGELOG.md
index 959c836..9b5c49b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -92,9 +92,10 @@ releases may contain breaking changes.
   auto-detected or set with `--langs`. `validate` supports `--format json`
   (machine-readable findings), `--strict` (warnings become errors),
   `--no-check-media` (skip the filesystem media-presence check),
-  `--require-ids` (error on entries/senses missing a stable id), and `-` to
-  read from stdin; `stats` also takes `--format json`. `validate`'s exit codes
-  and JSON schema are a supported interface.
+  `--allow CODE[,CODE...]` (report the given codes' findings but leave them out
+  of the pass/fail decision), `--require-ids` (error on entries/senses missing
+  a stable id), and `-` to read from stdin; `stats` also takes `--format json`.
+  `validate`'s exit codes and JSON schema are a supported interface.
 - Container image and GitHub Action wrapping `sil-lift validate`, so a
   non-Python CI pipeline can run the conformance check with no local Python
   toolchain (`Dockerfile`, `action.yml`, `docker-entrypoint.sh`).
diff --git a/action.yml b/action.yml
index 1c3a789..03859f7 100644
--- a/action.yml
+++ b/action.yml
@@ -18,6 +18,12 @@ inputs:
     description: "Skip the filesystem media-presence check."
     required: false
     default: "false"
+  allow:
+    description: >-
+      Problem codes to report but leave out of the pass/fail decision,
+      separated by commas, spaces, or newlines (e.g. "uri-not-rfc schema").
+    required: false
+    default: ""
 runs:
   using: "docker"
   image: "Dockerfile"
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index ac6be29..660a690 100644
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -29,4 +29,12 @@ if [ "$no_check_media" = "true" ]; then
   set -- "$@" --no-check-media
 fi
 
+# -d '' reads past newlines (a YAML block-scalar list) and returns 1 at EOF.
+IFS=$', \t\r\n' read -r -d '' -a allow_codes <<< "${INPUT_ALLOW:-}" || true
+for code in "${allow_codes[@]}"; do
+  if [ -n "$code" ]; then
+    set -- "$@" --allow "$code"
+  fi
+done
+
 exec sil-lift "$@"
diff --git a/docs/en/guides/cli.md b/docs/en/guides/cli.md
index 341a7a9..1c1e64d 100644
--- a/docs/en/guides/cli.md
+++ b/docs/en/guides/cli.md
@@ -3,7 +3,8 @@
 Installing the package (`pip install sil-lift`) also installs the `sil-lift` command — a supported tool in the spirit of LiftTools that ships with the package (and, for `validate`, a worked example of the library API).
 
 ```
-sil-lift validate PATH [--format {text,json}] [--strict] [--no-check-media] [--require-ids]
+sil-lift validate PATH [--format {text,json}] [--strict] [--no-check-media] [--allow CODE[,CODE...]]...
+                  [--require-ids]
                                            all problems, with file/entry/line; exit 1 on errors
 sil-lift stats PATH [--format {text,json}]
                                            entry/sense/language counts (streaming; any size)
@@ -15,6 +16,8 @@ sil-lift export PATH [-o OUT] [--langs L] [--tsv]
 
 `--format json` writes a single JSON object to stdout (and nothing else) for CI/automation consumption; see the schema in the example below. `--strict` treats warnings as errors, exiting 1 if any are found — use it to gate a build on no warnings at all rather than on errors alone. `--no-check-media` skips the filesystem media-presence check (suppressing `missing-media` findings), which is useful when validating a freshly generated export whose audio/photo files live elsewhere rather than in the same folder. `--require-ids` additionally fails (a `missing-id` error) on any entry lacking a `guid` or sense lacking an `id` — stricter than LIFT, for workflows that re-import by a stable id. Passing `-` as the path reads the document from stdin (a piped document has no folder, so its companion `.lift-ranges` and media are not resolved). `stats` likewise takes `--format json`, emitting the counts as a single JSON object.
 
+`--allow CODE[,CODE...]` (repeatable) reports the given codes' findings but leaves them out of the pass/fail decision. It applies to errors and warnings alike, so an allowed warning does not trip `--strict` either. The summary line tallies allowed findings per code; the JSON summary's `allowed` gives their total. A code that never occurs is ignored, so an allow list keeps working after a check is retired.
+
 !!! note
     `validate`'s exit codes and `--format json` schema are a supported automation interface: both are covered by tests and change only under SemVer.
 
@@ -55,7 +58,8 @@ $ sil-lift validate dictionary.lift --format json
   ],
   "summary": {
     "errors": 1,
-    "warnings": 1
+    "warnings": 1,
+    "allowed": 0
   }
 }
 
@@ -69,4 +73,4 @@ $ sil-lift export dictionary.lift --langs en,fr -o dictionary.csv
 
 All output is UTF-8, on every platform and whether it goes to a console, a pipe, or a `>` redirect — never the locale encoding (cp1252 on Windows, ASCII under a C/POSIX locale), which cannot represent LIFT content. `sil-lift export dictionary.lift > dictionary.csv` therefore writes exactly the bytes `-o dictionary.csv` writes, CRLF row terminators included.
 
-Exit codes: `0` success (warnings allowed, unless `--strict`), `1` findings (validation errors / missing media / warnings under `--strict`), `2` an I/O failure at either end — input that cannot be read, or output that cannot be written (a reader like `head` closing the pipe, a full disk).
+Exit codes: `0` success (warnings do not fail the run unless `--strict`), `1` findings (validation errors / missing media / warnings under `--strict`, not counting codes given to `--allow`), `2` an I/O failure at either end — input that cannot be read, or output that cannot be written (a reader like `head` closing the pipe, a full disk).
diff --git a/docs/en/guides/lift-export-interop.md b/docs/en/guides/lift-export-interop.md
index f5e3c84..07251dd 100644
--- a/docs/en/guides/lift-export-interop.md
+++ b/docs/en/guides/lift-export-interop.md
@@ -31,6 +31,7 @@ sil-lift validate export.lift --strict --no-check-media --format json
 - `--strict` makes warnings (not just errors) fail the run.
 - `--no-check-media` skips the filesystem media-presence check, whose `missing-media` findings are noise when the audio/photo files are not in the same folder as the `.lift` in CI.
 - `--format json` prints a single JSON object (`{"problems": [...], "summary": {...}}`) instead of human text; its exit codes and schema are a supported, SemVer-covered interface (see [the command line guide](cli.md)).
+- `--allow CODE[,CODE...]` (repeatable) keeps a tolerated code, such as FLEx's `uri-not-rfc`, from failing the run. Its findings are printed but not counted.
 - `--require-ids` additionally errors on entries missing a `guid` or senses missing an `id` — useful when a later re-import must update rather than duplicate.
 
 Guard against silent data loss (the failure mode that makes flat CSV export lossy) by asserting counts with `stats --format json` against your source model:
@@ -51,6 +52,7 @@ A TypeScript or C# project's CI can run the same check without installing Python
     path: export.lift
     strict: "true"
     no-check-media: "true"
+    allow: "uri-not-rfc"
     format: json
 ```
 
diff --git a/docs/en/guides/validate.md b/docs/en/guides/validate.md
index 729ae05..9d52ccb 100644
--- a/docs/en/guides/validate.md
+++ b/docs/en/guides/validate.md
@@ -28,7 +28,7 @@ Each `Problem` carries `level` (`"error"`/`"warning"`), a stable `code`, `messag
 
 ## Problem codes
 
-Every finding carries one of these, whichever layer produced it — `schema` and `uri-not-rfc` come from the schema layers, the other twelve are semantic checks. The strings are a supported interface; `--strict` promotes every warning to an error.
+Every finding carries one of these, whichever layer produced it — `schema` and `uri-not-rfc` come from the schema layers, the other twelve are semantic checks. The strings are a supported interface; `--strict` promotes every warning to an error. `sil-lift validate --allow CODE` leaves a code out of the pass/fail decision.
 
 | code                     | level   | what it flags                                                              |
 | ------------------------ | ------- | -------------------------------------------------------------------------- |
diff --git a/src/sil_lift/_cli.py b/src/sil_lift/_cli.py
index 1dcd3c1..c4da71e 100644
--- a/src/sil_lift/_cli.py
+++ b/src/sil_lift/_cli.py
@@ -72,16 +72,26 @@ def _collect_problems(args: argparse.Namespace) -> list[Problem]:
     ]
 
 
+def _code_list(value: str) -> list[str]:
+    return [code for part in value.split(",") if (code := part.strip())]
+
+
 def _cmd_validate(args: argparse.Namespace) -> int:
     problems = _collect_problems(args)
-    errors = sum(1 for problem in problems if problem.level == "error")
-    warnings = len(problems) - errors
+    allowed = Counter(problem.code for problem in problems if problem.code in args.allow)
+    counted = [problem for problem in problems if problem.code not in args.allow]
+    errors = sum(1 for problem in counted if problem.level == "error")
+    warnings = len(counted) - errors
     failed = bool(errors) or (args.strict and bool(warnings))
     if args.format == "json":
         json.dump(
             {
                 "problems": [_problem_json(problem) for problem in problems],
-                "summary": {"errors": errors, "warnings": warnings},
+                "summary": {
+                    "errors": errors,
+                    "warnings": warnings,
+                    "allowed": allowed.total(),
+                },
             },
             sys.stdout,
             indent=2,
@@ -91,7 +101,12 @@ def _cmd_validate(args: argparse.Namespace) -> int:
         for problem in problems:
             print(problem)
         strict_note = "  (strict: warnings treated as errors)" if args.strict and warnings else ""
-        print(f"{errors} error(s), {warnings} warning(s){strict_note}")
+        allowed_note = (
+            "; allowed: " + ", ".join(f"{code} {n}" for code, n in sorted(allowed.items()))
+            if allowed
+            else ""
+        )
+        print(f"{errors} error(s), {warnings} warning(s){allowed_note}{strict_note}")
     return 1 if failed else 0
 
 
@@ -342,6 +357,15 @@ def main(argv: Sequence[str] | None = None) -> int:
         action="store_true",
         help="skip the filesystem media-presence check (suppresses missing-media findings)",
     )
+    validate.add_argument(
+        "--allow",
+        action="extend",
+        type=_code_list,
+        default=[],
+        metavar="CODE[,CODE...]",
+        help="report these codes' findings but leave them out of the pass/fail decision "
+        "(comma-separated; repeatable)",
+    )
     validate.add_argument(
         "--require-ids",
         action="store_true",
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 1712365..8ac08d4 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -60,7 +60,7 @@ def test_validate_json_clean_file(capsys: pytest.CaptureFixture[str]) -> None:
     path = CORPUS_DIR / "ranges" / "test20080407.lift"
     assert main(["validate", str(path), "--format", "json"]) == 0
     payload = json.loads(capsys.readouterr().out)
-    assert payload == {"problems": [], "summary": {"errors": 0, "warnings": 0}}
+    assert payload == {"problems": [], "summary": {"errors": 0, "warnings": 0, "allowed": 0}}
 
 
 def test_validate_strict_treats_warnings_as_errors(capsys: pytest.CaptureFixture[str]) -> None:
@@ -78,6 +78,46 @@ def test_validate_no_check_media(capsys: pytest.CaptureFixture[str]) -> None:
     assert "[missing-media]" not in capsys.readouterr().out
 
 
+def test_validate_allow_excludes_a_warning_from_strict(capsys: pytest.CaptureFixture[str]) -> None:
+    path = CORPUS_DIR / "negative" / "flex-quirks.lift"
+    assert main(["validate", str(path), "--strict", "--allow", "uri-not-rfc"]) == 0
+    out = capsys.readouterr().out
+    assert "[uri-not-rfc]" in out  # still reported, just not counted
+    assert "0 error(s), 0 warning(s); allowed: uri-not-rfc 1" in out
+    assert "strict:" not in out
+
+
+def test_validate_allow_applies_to_errors(capsys: pytest.CaptureFixture[str]) -> None:
+    path = CORPUS_DIR / "negative" / "schema-invalid.lift"
+    assert main(["validate", str(path), "--allow", "schema"]) == 1  # form-missing-lang remains
+    assert "1 error(s), 0 warning(s); allowed: schema 2" in capsys.readouterr().out
+    argv = ["validate", str(path), "--allow", "schema", "--allow", "form-missing-lang"]
+    assert main(argv) == 0
+    assert "allowed: form-missing-lang 1, schema 2" in capsys.readouterr().out
+
+
+def test_validate_allow_comma_list(capsys: pytest.CaptureFixture[str]) -> None:
+    path = CORPUS_DIR / "negative" / "schema-invalid.lift"
+    assert main(["validate", str(path), "--allow", "schema, form-missing-lang,"]) == 0
+    assert "allowed: form-missing-lang 1, schema 2" in capsys.readouterr().out
+
+
+def test_validate_allow_unknown_code_is_a_no_op(capsys: pytest.CaptureFixture[str]) -> None:
+    path = CORPUS_DIR / "negative" / "flex-quirks.lift"
+    assert main(["validate", str(path), "--strict", "--allow", "no-such-code"]) == 1
+    out = capsys.readouterr().out
+    assert "0 error(s), 1 warning(s)  (strict: warnings treated as errors)" in out
+    assert "allowed" not in out
+
+
+def test_validate_allow_json(capsys: pytest.CaptureFixture[str]) -> None:
+    path = CORPUS_DIR / "negative" / "schema-invalid.lift"
+    assert main(["validate", str(path), "--format", "json", "--allow", "schema"]) == 1
+    payload = json.loads(capsys.readouterr().out)
+    assert payload["summary"] == {"errors": 1, "warnings": 0, "allowed": 2}
+    assert [problem["code"] for problem in payload["problems"]].count("schema") == 2
+
+
 def test_validate_require_ids(tmp_path: Path, capsys: pytest.CaptureFixture[str]) -> None:
     path = tmp_path / "noid.lift"
     path.write_bytes(
@@ -108,7 +148,7 @@ class _Stdin:
     monkeypatch.setattr("sys.stdin", _Stdin())
     assert main(["validate", "-", "--format", "json"]) == 0
     payload = json.loads(capsys.readouterr().out)
-    assert payload == {"problems": [], "summary": {"errors": 0, "warnings": 0}}
+    assert payload == {"problems": [], "summary": {"errors": 0, "warnings": 0, "allowed": 0}}
 
 
 def test_stats_json(capsys: pytest.CaptureFixture[str]) -> None: