diff --git a/README.md b/README.md
index b9a20075f6a1..552b71215cb9 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,8 @@ rich set of higher-level tools including Spark SQL for SQL and DataFrames,
 pandas API on Spark for pandas workloads, MLlib for machine learning, GraphX for graph processing,
 and Structured Streaming for stream processing.
 
-<https://spark.apache.org/>
+- Official version: <https://spark.apache.org/>
+- Development version: <https://apache.github.io/spark/>
 
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