diff --git a/mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java b/mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java
index e77edb3b..3ad8babb 100644
--- a/mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java
+++ b/mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java
@@ -1106,7 +1106,8 @@ public record PaginatedResult(@JsonProperty("nextCursor") String nextCursor) {
 	public record ProgressNotification(// @formatter:off
 		@JsonProperty("progressToken") String progressToken,
 		@JsonProperty("progress") double progress,
-		@JsonProperty("total") Double total) {
+		@JsonProperty("total") Double total,
+	   	@JsonProperty("message") String message) {
 	}// @formatter:on
 
 	/**