diff --git a/pyproject.toml b/pyproject.toml
index fceea1e..a7901e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "python-docs-vi-translator"
-version = "0.1.8"
+version = "0.1.9"
 description = "Translates the CPython documentation into Vietnamese gettext catalogs, with a deterministic audit over every string it writes"
 readme = "README.md"
 license = "MIT"
diff --git a/src/pydocvi/audit/language.py b/src/pydocvi/audit/language.py
index 37ac6f0..a8ef928 100644
--- a/src/pydocvi/audit/language.py
+++ b/src/pydocvi/audit/language.py
@@ -154,10 +154,33 @@ def l02_not_the_source(corpus: Corpus) -> Iterator[Finding]:
     what they are for. Everything else that is identical is either a model
     refusing the work or a classifier that should have called it passthrough,
     and both are worth a line in the report.
+
+    An entry whose whole ``msgid`` is a term the glossary keeps in English is
+    exempt too, and that exemption is the reason the glossary has a ``keep_en``
+    field at all. Narrowing the identifier rule put 6 558 single-word entries
+    into :meth:`Corpus.prose` for the first time and took this check from 10
+    findings to 144. A third of them were entries reading ``sys``, ``builtins``,
+    ``import``, ``exec``, ``NaN`` and ``Infinity``, all of which are index
+    entries naming a module or a statement, and all of which a reviewer left in
+    English because that is what a Vietnamese programmer calls them.
+
+    Nothing in the string can tell those from ``module``, ``object`` and
+    ``type``, which are the other 89 and are ordinary English words used as
+    index categories. ``sys`` and ``Notes`` are the same shape, and that is the
+    discrimination the classifier was narrowed for being unable to make. So it
+    is made once, by hand, in the glossary, where it is a written decision that
+    ``G03`` then checks in both directions rather than an exception buried here.
+
+    Matched on the whole ``msgid`` and not on a substring. A kept term inside a
+    sentence says nothing about whether the sentence was translated, and this
+    check is about the entry.
     """
+    kept = {term.en for term in corpus.glossary.kept} if corpus.glossary is not None else set()
     for one, entry in corpus.translated():
         if classify.classify(entry.msgid) in PASSTHROUGH:
             continue
+        if entry.msgid.strip() in kept:
+            continue
         if entry.msgstr.strip() == entry.msgid.strip():
             yield Finding(
                 check="L02",
diff --git a/tests/test_audit_language.py b/tests/test_audit_language.py
index 52100d2..4f7ffae 100644
--- a/tests/test_audit_language.py
+++ b/tests/test_audit_language.py
@@ -5,8 +5,12 @@
 which correct translations those are.
 """
 
+from dataclasses import replace
+
 from conftest import catalog_of, corpus_of, entry, findings, machine_segment
 from pydocvi.audit import language
+from pydocvi.audit.model import Corpus
+from pydocvi.glossary import Glossary, Term
 from pydocvi.memory import Memory
 
 
@@ -14,6 +18,12 @@ def over(msgid: str, msgstr: str, **overrides: object) -> object:
     return corpus_of(catalog_of(entry(msgid, msgstr, **overrides)))
 
 
+def with_kept(corpus: object, *english: str) -> Corpus:
+    """The same corpus with a glossary that keeps these terms in English."""
+    terms = tuple(Term(en=one, vi=one, keep_en=True) for one in english)
+    return replace(corpus, glossary=Glossary(version=1, terms=terms))  # type: ignore[type-var]
+
+
 class TestL01:
     LONG = "A sentence long enough that a reader would expect a diacritic in it."
 
@@ -51,6 +61,31 @@ def test_a_real_translation_is_clean(self) -> None:
             == []
         )
 
+    def test_an_entry_that_is_a_kept_term_is_the_glossary_s_business(self) -> None:
+        """``sys`` is an index entry naming a module and a reviewer left it in
+        English because that is what a Vietnamese programmer calls it. Nothing
+        in the string separates it from ``Notes``, so the decision is made once
+        in the glossary and ``G03`` checks it in both directions."""
+        corpus = over("sys", "sys", flags=())
+        assert len(findings(language.l02_not_the_source, corpus)) == 1
+        assert findings(language.l02_not_the_source, with_kept(corpus, "sys")) == []
+
+    def test_a_kept_term_inside_a_sentence_exempts_nothing(self) -> None:
+        """Matched on the whole ``msgid``. A kept term in a sentence says
+        nothing about whether the sentence was translated."""
+        english = "Import the sys module first."
+        corpus = with_kept(over(english, english), "sys")
+        assert len(findings(language.l02_not_the_source, corpus)) == 1
+
+    def test_a_word_the_glossary_does_not_keep_is_still_reported(self) -> None:
+        """``module`` is the other side of the same 144 findings, an ordinary
+        English word used as an index category, and it wants translating."""
+        corpus = with_kept(over("module", "module", flags=()), "sys")
+        assert len(findings(language.l02_not_the_source, corpus)) == 1
+
+    def test_no_glossary_means_no_exemption_rather_than_a_crash(self) -> None:
+        assert len(findings(language.l02_not_the_source, over("sys", "sys", flags=()))) == 1
+
 
 class TestL03:
     def test_a_model_talking_about_the_work_is_found(self) -> None:
diff --git a/uv.lock b/uv.lock
index b9177c3..bca7aab 100644
--- a/uv.lock
+++ b/uv.lock
@@ -678,7 +678,7 @@ wheels = [
 
 [[package]]
 name = "python-docs-vi-translator"
-version = "0.1.8"
+version = "0.1.9"
 source = { editable = "." }
 dependencies = [
     { name = "httpx" },