diff --git a/src/Spectre.Console/Internal/Text/Markup/MarkupTokenizer.cs b/src/Spectre.Console/Internal/Text/Markup/MarkupTokenizer.cs
index c2fc8e1..df62a94 100644
--- a/src/Spectre.Console/Internal/Text/Markup/MarkupTokenizer.cs
+++ b/src/Spectre.Console/Internal/Text/Markup/MarkupTokenizer.cs
@@ -113,7 +113,7 @@ internal sealed class MarkupTokenizer : IDisposable
                     if (encounteredClosing)
                     {
                         throw new InvalidOperationException(
-                            $"Encountered unescaped ']' token at position {_reader.Position}");
+                            $"Encountered unescaped ']' token at position {_reader.Position}.");
                     }
                 }
 
@@ -122,7 +122,7 @@ internal sealed class MarkupTokenizer : IDisposable
 
             if (encounteredClosing)
             {
-                throw new InvalidOperationException($"Encountered unescaped ']' token at position {_reader.Position}");
+                throw new InvalidOperationException($"Encountered unescaped ']' token at position {_reader.Position}.");
             }
 
             Current = new MarkupToken(MarkupTokenKind.Text, builder.ToString(), position);
diff --git a/test/Spectre.Console.Tests/Unit/Widgets/MarkupTests.cs b/test/Spectre.Console.Tests/Unit/Widgets/MarkupTests.cs
index aad415c..26967a9 100644
--- a/test/Spectre.Console.Tests/Unit/Widgets/MarkupTests.cs
+++ b/test/Spectre.Console.Tests/Unit/Widgets/MarkupTests.cs
@@ -107,7 +107,7 @@ public sealed class MarkupTests
         // Then
         result.ShouldNotBeNull();
         result.ShouldBeOfType<InvalidOperationException>();
-        result.Message.ShouldBe("Encountered unescaped ']' token at position 16");
+        result.Message.ShouldBe("Encountered unescaped ']' token at position 16.");
     }
 
     [Fact]