diff --git a/docs/csharp/language-reference/builtin-types/enum.md b/docs/csharp/language-reference/builtin-types/enum.md
index 2fb7ebfa3eea2..0fd026d47aae1 100644
--- a/docs/csharp/language-reference/builtin-types/enum.md
+++ b/docs/csharp/language-reference/builtin-types/enum.md
@@ -5,6 +5,7 @@ ms.date: 12/13/2019
 f1_keywords:
   - "enum"
   - "enum_CSharpKeyword"
+  - "enumconstraint"
 helpviewer_keywords:
   - "enum keyword [C#]"
   - "enum type [C#]"
diff --git a/docs/csharp/language-reference/builtin-types/ref-struct.md b/docs/csharp/language-reference/builtin-types/ref-struct.md
index bdb072b47737e..038ad47a7544e 100644
--- a/docs/csharp/language-reference/builtin-types/ref-struct.md
+++ b/docs/csharp/language-reference/builtin-types/ref-struct.md
@@ -2,6 +2,11 @@
 title: "ref struct types"
 description: Learn about the ref struct type in C#
 ms.date: 01/27/2025
+f1_keywords:
+  - "refstruct"
+  - "refstruct_CSharpKeyword"
+helpviewer_keywords:
+  - "ref struct [C#]"
 ---
 # `ref` structure types (C# reference)
 
diff --git a/docs/csharp/language-reference/keywords/extension.md b/docs/csharp/language-reference/keywords/extension.md
index a743f23b6b990..05ca6c04cae09 100644
--- a/docs/csharp/language-reference/keywords/extension.md
+++ b/docs/csharp/language-reference/keywords/extension.md
@@ -5,6 +5,9 @@ ms.date: 04/17/2025
 f1_keywords:
   - "extension_CSharpKeyword"
   - "extension"
+helpviewer_keywords:
+  - "extension methods [C#]"
+  - "this parameter modifier [C#]"
 ---
 # Extension declaration (C# Reference)
 
diff --git a/docs/csharp/language-reference/keywords/in-generic-modifier.md b/docs/csharp/language-reference/keywords/in-generic-modifier.md
index 656c395785123..4865c1686c51e 100644
--- a/docs/csharp/language-reference/keywords/in-generic-modifier.md
+++ b/docs/csharp/language-reference/keywords/in-generic-modifier.md
@@ -2,6 +2,9 @@
 description: "in (Generic Modifier) - C# Reference"
 title: "in (Generic Modifier)"
 ms.date: 07/20/2015
+f1_keywords:
+  - "ingenericmodifier"
+  - "ingenericmodifier_CSharpKeyword"
 helpviewer_keywords: 
   - "contravariance, in keyword [C#]"
   - "in keyword [C#]"
diff --git a/docs/csharp/language-reference/keywords/method-parameters.md b/docs/csharp/language-reference/keywords/method-parameters.md
index 187d2c450bb57..0fa47a91c6440 100644
--- a/docs/csharp/language-reference/keywords/method-parameters.md
+++ b/docs/csharp/language-reference/keywords/method-parameters.md
@@ -2,6 +2,11 @@
 title: "Method parameters and modifiers"
 description: "Parameter modifiers enable pass-by-reference semantics, with distinctions for read-only, and `out` parameters. The `params` modifier allows optional arguments."
 ms.date: 11/19/2024
+f1_keywords:
+  - "params_CSharpKeyword"
+  - "inparametermodifier"
+  - "outparametermodifier"
+  - "refparametermodifier"
 helpviewer_keywords: 
   - "methods [C#], parameters"
   - "method parameters [C#]"
diff --git a/docs/csharp/language-reference/keywords/new-constraint.md b/docs/csharp/language-reference/keywords/new-constraint.md
index b7824b7ab4ab5..cc1d336fa4194 100644
--- a/docs/csharp/language-reference/keywords/new-constraint.md
+++ b/docs/csharp/language-reference/keywords/new-constraint.md
@@ -2,6 +2,9 @@
 description: "new constraint - C# Reference"
 title: "new constraint"
 ms.date: 07/20/2015
+f1_keywords:
+  - "newconstraint"
+  - "newconstraint_CSharpKeyword"
 helpviewer_keywords: 
   - "new constraint keyword [C#]"
 ms.assetid: 58850b64-cb97-4136-be50-1f3bc7fc1da9
diff --git a/docs/csharp/language-reference/keywords/new-modifier.md b/docs/csharp/language-reference/keywords/new-modifier.md
index 13ad27d9e7214..7ae091a314f04 100644
--- a/docs/csharp/language-reference/keywords/new-modifier.md
+++ b/docs/csharp/language-reference/keywords/new-modifier.md
@@ -2,6 +2,9 @@
 description: "new modifier - C# Reference"
 title: "new modifier"
 ms.date: 07/20/2015
+f1_keywords:
+  - "newmodifier"
+  - "newmodifier_CSharpKeyword"
 helpviewer_keywords: 
   - "new modifier keyword [C#]"
 ms.assetid: a2e20856-33b9-4620-b535-a60dbce8349b
diff --git a/docs/csharp/language-reference/keywords/out-generic-modifier.md b/docs/csharp/language-reference/keywords/out-generic-modifier.md
index 580d58ce3db60..020b6430aefce 100644
--- a/docs/csharp/language-reference/keywords/out-generic-modifier.md
+++ b/docs/csharp/language-reference/keywords/out-generic-modifier.md
@@ -2,6 +2,9 @@
 description: "out keyword (generic modifier) - C# Reference"
 title: "out keyword (generic modifier)"
 ms.date: 07/20/2015
+f1_keywords:
+  - "outgenericmodifier"
+  - "outgenericmodifier_CSharpKeyword"
 helpviewer_keywords: 
   - "covariance, out keyword [C#]"
   - "out keyword [C#]"