diff --git a/docs/guide/rules.md b/docs/guide/rules.md
index 8fc4d62..e49ab08 100644
--- a/docs/guide/rules.md
+++ b/docs/guide/rules.md
@@ -21,7 +21,7 @@ The `name` is used to reference the rule in `apply` blocks and in `# pnl: ignore
 
 | Field | Required | Description |
 |-------|----------|-------------|
-| `name` | Yes | Unique identifier, referenced in `apply` and `# pnl: ignore` |
+| `name` | Yes | Unique identifier, referenced in `apply` and `# pnl: ignore`. Must match `[a-zA-Z0-9_.-]+` |
 | `description` | No | Human-readable description shown in violation output |
 | `type` | Yes | What kind of name to lint (`variable`, `function`, `class`, `module`, `package`) |
 | `filter` | No | Narrow which names are checked (see [Filters](#filters) below) |
@@ -917,7 +917,7 @@ apply:
 
 | Field | Required | Description |
 |-------|----------|-------------|
-| `name` | Yes | Unique identifier, referenced in `apply` and `# pnl: ignore` |
+| `name` | Yes | Unique identifier, referenced in `apply` and `# pnl: ignore`. Must match `[a-zA-Z0-9_.-]+` |
 | `description` | No | Human-readable description shown in violation output |
 | `type` | Yes | What kind of name to lint (`variable`, `function`, `class`, `module`, `package`) |
 | `filter` | No | Narrow which names are checked |
diff --git a/python_naming_linter/config.py b/python_naming_linter/config.py
index 2486789..3ec0655 100644
--- a/python_naming_linter/config.py
+++ b/python_naming_linter/config.py
@@ -6,7 +6,7 @@
 
 import yaml
 
-_VALID_RULE_NAME_RE = re.compile(r"^[a-zA-Z0-9_-]+$")
+_VALID_RULE_NAME_RE = re.compile(r"^[a-zA-Z0-9_.\-]+$")
 
 
 @dataclass
@@ -36,7 +36,7 @@ class Config:
 def _validate_rule_name(name: str) -> None:
     if not _VALID_RULE_NAME_RE.match(name):
         raise ValueError(
-            f"Invalid rule name '{name}'. Rule names must match [a-zA-Z0-9_-]+"
+            f"Invalid rule name '{name}'. Rule names must match [a-zA-Z0-9_.-]+"
         )
 
 
diff --git a/python_naming_linter/ignore.py b/python_naming_linter/ignore.py
index 15f1bdd..0fa8635 100644
--- a/python_naming_linter/ignore.py
+++ b/python_naming_linter/ignore.py
@@ -4,7 +4,7 @@
 
 from python_naming_linter.checkers import Violation
 
-_IGNORE_RE = re.compile(r"#\s*pnl:\s*ignore(?:=([a-zA-Z0-9_,\s-]+))?$")
+_IGNORE_RE = re.compile(r"#\s*pnl:\s*ignore(?:=([a-zA-Z0-9_.,\s-]+))?$")
 
 
 def parse_ignore_comments(source: str) -> dict[int, set[str] | None]:
diff --git a/tests/test_config.py b/tests/test_config.py
index 9a393b7..9f191d3 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -127,7 +127,14 @@ def test_find_config_skips_pyproject_without_section(tmp_path, monkeypatch):
 
 @pytest.mark.parametrize(
     "name",
-    ["attribute-matches-type", "bool_method", "rule1", "My-Rule_2"],
+    [
+        "attribute-matches-type",
+        "bool_method",
+        "rule1",
+        "My-Rule_2",
+        "rule.name",
+        "shared.domain",
+    ],
 )
 def test_valid_rule_names(tmp_path, name):
     config_content = f"""\
@@ -148,7 +155,7 @@ def test_valid_rule_names(tmp_path, name):
 
 @pytest.mark.parametrize(
     "name",
-    ["my rule", "rule!name", "rule name 123", "rule.name", "rule@name"],
+    ["my rule", "rule!name", "rule name 123", "rule@name"],
 )
 def test_invalid_rule_names(tmp_path, name):
     config_content = f"""\
diff --git a/tests/test_ignore.py b/tests/test_ignore.py
index 840454c..15756c2 100644
--- a/tests/test_ignore.py
+++ b/tests/test_ignore.py
@@ -44,6 +44,16 @@ def test_extra_space_after_pnl(self):
         source = "x: int = 1  # pnl:  ignore\n"
         assert parse_ignore_comments(source) == {1: None}
 
+    def test_ignore_rule_with_dot(self):
+        source = "x: int = 1  # pnl: ignore=shared.domain\n"
+        assert parse_ignore_comments(source) == {1: {"shared.domain"}}
+
+    def test_ignore_multiple_rules_with_dots(self):
+        source = "x: int = 1  # pnl: ignore=shared.domain,context.adapters\n"
+        assert parse_ignore_comments(source) == {
+            1: {"shared.domain", "context.adapters"}
+        }
+
 
 class TestFilterViolations:
     def _make_violation(self, rule_name: str, lineno: int) -> Violation: