diff --git a/src/main/java/com/alibaba/druid/util/JdbcUtils.java b/src/main/java/com/alibaba/druid/util/JdbcUtils.java
index 023a777ad9..129cc7745e 100644
--- a/src/main/java/com/alibaba/druid/util/JdbcUtils.java
+++ b/src/main/java/com/alibaba/druid/util/JdbcUtils.java
@@ -419,7 +419,7 @@ public final class JdbcUtils {
         } else if (rawUrl.startsWith("jdbc:mimer:multi1:")) {
             return "com.mimer.jdbc.Driver";
         } else {
-            throw new SQLException("unkow jdbc driver");
+            throw new SQLException("unkow jdbc driver : " + rawUrl);
         }
     }
 }