diff --git a/StyleCop.Analyzers/StyleCop.Analyzers.Test/DocumentationRules/SA1642UnitTests.cs b/StyleCop.Analyzers/StyleCop.Analyzers.Test/DocumentationRules/SA1642UnitTests.cs
index 09de7695e..f651fef33 100644
--- a/StyleCop.Analyzers/StyleCop.Analyzers.Test/DocumentationRules/SA1642UnitTests.cs
+++ b/StyleCop.Analyzers/StyleCop.Analyzers.Test/DocumentationRules/SA1642UnitTests.cs
@@ -93,7 +93,15 @@ public async Task TestNonPrivateConstructorCorrectDocumentationGenericCustomized
         [InlineData("struct")]
         public async Task TestPrivateConstructorCorrectDocumentationAsync(string typeKind)
         {
-            await this.TestConstructorCorrectDocumentationAsync(typeKind, "private", PrivateConstructorStandardText[0], $" {typeKind}" + PrivateConstructorStandardText[1], string.Empty, false).ConfigureAwait(false);
+            await this.TestConstructorCorrectDocumentationAsync(typeKind, "private", PrivateConstructorStandardText[0], $" {typeKind}{PrivateConstructorStandardText[1]}.", string.Empty, false).ConfigureAwait(false);
+        }
+
+        [Theory]
+        [InlineData("class")]
+        [InlineData("struct")]
+        public async Task TestPrivateConstructorCorrectExtendedDocumentationAsync(string typeKind)
+        {
+            await this.TestConstructorCorrectDocumentationAsync(typeKind, "private", PrivateConstructorStandardText[0], $" {typeKind}{PrivateConstructorStandardText[1]} externally.", string.Empty, false).ConfigureAwait(false);
         }
 
         [Theory]
@@ -117,7 +125,15 @@ public async Task TestPrivateConstructorCorrectDocumentation_NonPrivateCustomize
         [InlineData("struct")]
         public async Task TestPrivateConstructorCorrectDocumentationGenericAsync(string typeKind)
         {
-            await this.TestConstructorCorrectDocumentationAsync(typeKind, "private", PrivateConstructorStandardText[0], $" {typeKind}" + PrivateConstructorStandardText[1], string.Empty, true).ConfigureAwait(false);
+            await this.TestConstructorCorrectDocumentationAsync(typeKind, "private", PrivateConstructorStandardText[0], $" {typeKind}{PrivateConstructorStandardText[1]}.", string.Empty, true).ConfigureAwait(false);
+        }
+
+        [Theory]
+        [InlineData("class")]
+        [InlineData("struct")]
+        public async Task TestPrivateConstructorCorrectExtendedDocumentationGenericAsync(string typeKind)
+        {
+            await this.TestConstructorCorrectDocumentationAsync(typeKind, "private", PrivateConstructorStandardText[0], $" {typeKind}{PrivateConstructorStandardText[1]} externally.", string.Empty, true).ConfigureAwait(false);
         }
 
         [Theory]