diff --git a/src/TodoByDateRule.php b/src/TodoByDateRule.php
index 70a801f..602bc87 100644
--- a/src/TodoByDateRule.php
+++ b/src/TodoByDateRule.php
@@ -99,9 +99,9 @@ public function processNode(Node $node, Scope $scope): array
                 // Have always present date at the start of the message.
                 // If there is further text, append it.
                 if ($todoText !== '') {
-                    $errorMessage = "Expired on {$date}: {$todoText}";
+                    $errorMessage = "Expired on {$date}: ". rtrim($todoText, '.') .".";
                 } else {
-                    $errorMessage = "Comment expired on {$date}";
+                    $errorMessage = "Comment expired on {$date}.";
                 }
 
                 $wholeMatchStartOffset = $match[0][1];
diff --git a/tests/TodoByDateRuleTest.php b/tests/TodoByDateRuleTest.php
index 10e7f8c..a4e90dc 100644
--- a/tests/TodoByDateRuleTest.php
+++ b/tests/TodoByDateRuleTest.php
@@ -23,51 +23,51 @@ public function testRule(): void
 
         $this->analyse([__DIR__ . '/data/example.php'], [
             [
-                'Expired on 2023-12-14: Expired comment1',
+                'Expired on 2023-12-14: Expired comment1.',
                 9,
             ],
             [
-                'Expired on 2023-12-14: Expired comment2',
+                'Expired on 2023-12-14: Expired comment2.',
                 10,
             ],
             [
-                'Expired on 2023-12-14: Expired comment3',
+                'Expired on 2023-12-14: Expired comment3.',
                 11,
             ],
             [
-                'Expired on 2023-12-14: Expired comment4',
+                'Expired on 2023-12-14: Expired comment4.',
                 12,
             ],
             [
-                'Expired on 2023-12-14: Expired comment5',
+                'Expired on 2023-12-14: Expired comment5.',
                 13,
             ],
             [
-                'Expired on 2023-12-14: Expired commentX',
+                'Expired on 2023-12-14: Expired commentX.',
                 19,
             ],
             [
-                'Comment expired on 2023-12-14',
+                'Comment expired on 2023-12-14.',
                 21,
             ],
             [
-                'Expired on 2023-12-14: class comment',
+                'Expired on 2023-12-14: class comment.',
                 29,
             ],
             [
-                'Expired on 2023-12-13: class comment',
+                'Expired on 2023-12-13: class comment.',
                 30,
             ],
             [
-                "Expired on 2023-12-14: method comment",
+                "Expired on 2023-12-14: method comment.",
                 34,
             ],
             [
-                'Expired on 2023-12-14: in method comment1',
+                'Expired on 2023-12-14: in method comment1.',
                 36,
             ],
             [
-                'Expired on 2023-12-14: in method comment2',
+                'Expired on 2023-12-14: in method comment2.',
                 38,
             ],
             [
@@ -75,35 +75,35 @@ public function testRule(): void
                 43,
             ],
             [
-                'Expired on 2023-12-14: Decide to fix all the broken instances of class as a string',
+                'Expired on 2023-12-14: Decide to fix all the broken instances of class as a string.',
                 46,
             ],
             [
-                'Expired on 2023-12-14: fix it',
+                'Expired on 2023-12-14: fix it.',
                 48,
             ],
             [
-                'Expired on 2023-12-14: fix it',
+                'Expired on 2023-12-14: fix it.',
                 49,
             ],
             [
-                'Expired on 2023-12-14: fix it',
+                'Expired on 2023-12-14: fix it.',
                 50,
             ],
             [
-                'Expired on 2023-12-14: fix it',
+                'Expired on 2023-12-14: fix it.',
                 51,
             ],
             [
-                'Expired on 2023-12-14: fix it',
+                'Expired on 2023-12-14: fix it.',
                 53,
             ],
             [
-                'Expired on 2023-12-14: fix it',
+                'Expired on 2023-12-14: fix it.',
                 54,
             ],
             [
-                'Expired on 2023-12-14: classic multi line comment',
+                'Expired on 2023-12-14: classic multi line comment.',
                 59,
             ],
         ]);
@@ -122,7 +122,7 @@ public function testReferenceTime2(): void
 
         $this->analyse([__DIR__ . '/data/referenceTime.php'], [
             [
-                'Expired on 2023-01-14: fix it',
+                'Expired on 2023-01-14: fix it.',
                 5,
             ],
         ]);