diff --git a/mlir/lib/Tools/mlir-lsp-server/lsp/Protocol.h b/mlir/lib/Tools/mlir-lsp-server/lsp/Protocol.h
index de08fa247bd84a..1f67b0dcad1dad 100644
--- a/mlir/lib/Tools/mlir-lsp-server/lsp/Protocol.h
+++ b/mlir/lib/Tools/mlir-lsp-server/lsp/Protocol.h
@@ -128,6 +128,7 @@ class URIForFile {
   std::string uriStr;
 };
 
+/// Add support for JSON serialization.
 llvm::json::Value toJSON(const URIForFile &value);
 bool fromJSON(const llvm::json::Value &value, URIForFile &result,
               llvm::json::Path path);
@@ -142,6 +143,8 @@ enum class TraceLevel {
   Messages = 1,
   Verbose = 2,
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value, TraceLevel &result,
               llvm::json::Path path);
 
@@ -149,6 +152,8 @@ struct InitializeParams {
   /// The initial trace setting. If omitted trace is disabled ('off').
   Optional<TraceLevel> trace;
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value, InitializeParams &result,
               llvm::json::Path path);
 
@@ -176,6 +181,8 @@ struct TextDocumentItem {
   /// The content of the opened text document.
   std::string text;
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value, TextDocumentItem &result,
               llvm::json::Path path);
 
@@ -187,6 +194,8 @@ struct TextDocumentIdentifier {
   /// The text document's URI.
   URIForFile uri;
 };
+
+/// Add support for JSON serialization.
 llvm::json::Value toJSON(const TextDocumentIdentifier &value);
 bool fromJSON(const llvm::json::Value &value, TextDocumentIdentifier &result,
               llvm::json::Path path);
@@ -218,6 +227,8 @@ struct Position {
            std::tie(rhs.line, rhs.character);
   }
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value, Position &result,
               llvm::json::Path path);
 llvm::json::Value toJSON(const Position &value);
@@ -253,6 +264,8 @@ struct Range {
     return start <= range.start && range.end <= end;
   }
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value, Range &result,
               llvm::json::Path path);
 llvm::json::Value toJSON(const Range &value);
@@ -279,6 +292,8 @@ struct Location {
     return std::tie(lhs.uri, lhs.range) < std::tie(rhs.uri, rhs.range);
   }
 };
+
+/// Add support for JSON serialization.
 llvm::json::Value toJSON(const Location &value);
 raw_ostream &operator<<(raw_ostream &os, const Location &value);
 
@@ -293,6 +308,8 @@ struct TextDocumentPositionParams {
   /// The position inside the text document.
   Position position;
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value,
               TextDocumentPositionParams &result, llvm::json::Path path);
 
@@ -304,12 +321,16 @@ struct ReferenceContext {
   /// Include the declaration of the current symbol.
   bool includeDeclaration = false;
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value, ReferenceContext &result,
               llvm::json::Path path);
 
 struct ReferenceParams : public TextDocumentPositionParams {
   ReferenceContext context;
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value, ReferenceParams &result,
               llvm::json::Path path);
 
@@ -321,6 +342,8 @@ struct DidOpenTextDocumentParams {
   /// The document that was opened.
   TextDocumentItem textDocument;
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value, DidOpenTextDocumentParams &result,
               llvm::json::Path path);
 
@@ -332,6 +355,8 @@ struct DidCloseTextDocumentParams {
   /// The document that was closed.
   TextDocumentIdentifier textDocument;
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value,
               DidCloseTextDocumentParams &result, llvm::json::Path path);
 
@@ -349,6 +374,8 @@ struct TextDocumentContentChangeEvent {
   /// The new text of the range/document.
   std::string text;
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value,
               TextDocumentContentChangeEvent &result, llvm::json::Path path);
 
@@ -359,6 +386,8 @@ struct DidChangeTextDocumentParams {
   /// The actual content changes.
   std::vector<TextDocumentContentChangeEvent> contentChanges;
 };
+
+/// Add support for JSON serialization.
 bool fromJSON(const llvm::json::Value &value,
               DidChangeTextDocumentParams &result, llvm::json::Path path);
 
@@ -378,6 +407,8 @@ struct MarkupContent {
   MarkupKind kind = MarkupKind::PlainText;
   std::string value;
 };
+
+/// Add support for JSON serialization.
 llvm::json::Value toJSON(const MarkupContent &mc);
 
 //===----------------------------------------------------------------------===//
@@ -395,6 +426,8 @@ struct Hover {
   /// visualize a hover, e.g. by changing the background color.
   Optional<Range> range;
 };
+
+/// Add support for JSON serialization.
 llvm::json::Value toJSON(const Hover &hover);
 
 //===----------------------------------------------------------------------===//
@@ -413,6 +446,8 @@ struct DiagnosticRelatedInformation {
   /// The message of this related diagnostic information.
   std::string message;
 };
+
+/// Add support for JSON serialization.
 llvm::json::Value toJSON(const DiagnosticRelatedInformation &info);
 
 //===----------------------------------------------------------------------===//
@@ -454,6 +489,8 @@ struct Diagnostic {
   /// which the issue was produced, e.g. "Semantic Issue" or "Parse Issue".
   Optional<std::string> category;
 };
+
+/// Add support for JSON serialization.
 llvm::json::Value toJSON(const Diagnostic &diag);
 
 //===----------------------------------------------------------------------===//
@@ -468,6 +505,8 @@ struct PublishDiagnosticsParams {
   /// The list of reported diagnostics.
   std::vector<Diagnostic> diagnostics;
 };
+
+/// Add support for JSON serialization.
 llvm::json::Value toJSON(const PublishDiagnosticsParams &params);
 
 } // namespace lsp