default value of radar line changed to round apache/echarts#15381
diff --git a/en/option/series/radar.md b/en/option/series/radar.md
index 23d28a7..f68c981 100644
--- a/en/option/series/radar.md
+++ b/en/option/series/radar.md
@@ -66,7 +66,8 @@
 Line style.
 
 {{ use: partial-line-style(
-    prefix = "##"
+    prefix = "##",
+    defaultJoin = "'round'"
 ) }}
 
 ## areaStyle(Object)
@@ -177,7 +178,8 @@
 Line style of a single item.
 
 {{ use: partial-line-style(
-    prefix = "###"
+    prefix = "###",
+    defaultJoin = "'round'"
 ) }}
 
 ### areaStyle(Object)
@@ -261,7 +263,8 @@
 #${prefix} lineStyle(Object)
 
 {{ use: partial-line-style(
-    prefix = "#" + ${prefix}
+    prefix = "#" + ${prefix},
+    defaultJoin = "'round'"
 ) }}
 
 #${prefix} areaStyle(Object)
diff --git a/zh/option/series/radar.md b/zh/option/series/radar.md
index e3e5545..54ce1b2 100644
--- a/zh/option/series/radar.md
+++ b/zh/option/series/radar.md
@@ -102,7 +102,8 @@
 线条样式。
 
 {{ use: partial-line-style(
-    prefix = "##"
+    prefix = "##",
+    defaultJoin = "'round'"
 ) }}
 
 ## areaStyle(Object)
@@ -213,7 +214,8 @@
 单项线条样式。
 
 {{ use: partial-line-style(
-    prefix = "###"
+    prefix = "###",
+    defaultJoin = "'round'"
 ) }}
 
 ### areaStyle(Object)
@@ -297,7 +299,8 @@
 #${prefix} lineStyle(Object)
 
 {{ use: partial-line-style(
-    prefix = "#" + ${prefix}
+    prefix = "#" + ${prefix},
+    defaultJoin = "'round'"
 ) }}
 
 #${prefix} areaStyle(Object)