From 89381e14f9c29c4ee240c5e55c66ab44381924ca Mon Sep 17 00:00:00 2001
From: Wu Sheng <wu.sheng@foxmail.com>
Date: Wed, 5 Aug 2020 17:39:33 +0800
Subject: [PATCH] Add special tags doc link.

---
 language-agent/Tracing.proto | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/language-agent/Tracing.proto b/language-agent/Tracing.proto
index a8142b3..e4abc64 100644
--- a/language-agent/Tracing.proto
+++ b/language-agent/Tracing.proto
@@ -143,6 +143,9 @@ message SpanObject {
     bool isError = 11;
     // String key, String value pair.
     // Tags provides more informance, includes parameters.
+    //
+    // In the OAP backend analysis, some special tag or tag combination could provide other advanced features.
+    // https://github.com/apache/skywalking/blob/master/docs/en/guides/Java-Plugin-Development-Guide.md#special-span-tags
     repeated KeyStringValuePair tags = 12;
     // String key, String value pair with an accurate timestamp.
     // Logging some events happening in the context of the span duration.
-- 
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