diff --git a/README.md b/README.md
index 9de7734f..b6155698 100644
--- a/README.md
+++ b/README.md
@@ -139,6 +139,10 @@ make CHIP=bl808 BOARD=bl808dk CPU_ID=m0
 
 TODO
 
+## Debug
+
+Only supports debug with CKLink currently. See [bl mcu sdk debug chapter](https://bl-mcu-sdk.readthedocs.io/zh_CN/latest/get_started/debug.html)。
+
 # Resources
 
 ## Chip Manual
diff --git a/README_zh.md b/README_zh.md
index 9b19806c..5b545899 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -139,6 +139,10 @@ make CHIP=bl808 BOARD=bl808dk CPU_ID=m0
 
 TODO
 
+## 调试
+
+当前仅支持使用 CKLink 调试。详细参考 [bl mcu sdk 调试章节](https://bl-mcu-sdk.readthedocs.io/zh_CN/latest/get_started/debug.html)。
+
 # 芯片手册
 
 芯片数据手册和参考手册见 [文档](https://dev.bouffalolab.com/document)。
diff --git a/docs/source/api_reference/utils/libc.rst b/docs/source/api_reference/utils/libc.rst
index 7f5579a7..10ef51ce 100644
--- a/docs/source/api_reference/utils/libc.rst
+++ b/docs/source/api_reference/utils/libc.rst
@@ -5,7 +5,7 @@ LIBC
 ------------
 - LIBC 中实现了一个vsnprintf，用以避开使用完整的c库，减少代码体积。
 
-.. note:: LIBC 中浮点打印只能最大支持到11位小数精度
+.. note:: LIBC 中浮点打印只能最大支持到7位小数精度
 
 配置LIBC相关功能
 ------------
diff --git a/docs/source/get_started/debug.rst b/docs/source/get_started/debug.rst
index 11980411..29ddbef4 100644
--- a/docs/source/get_started/debug.rst
+++ b/docs/source/get_started/debug.rst
@@ -5,6 +5,39 @@
 
 本节主要介绍如何使用调试器进行代码的调试。
 
+芯片默认 JTAG PIN 列表
+-------------------------------------------
+
+.. list-table::
+    :widths: 10 10 10 10 10
+    :header-rows: 1
+
+    * - CHIP/Pin
+      - BL602/BL604
+      - BL702/BL704/BL706
+      - BL616/BL618
+      - BL808
+    * - TMS
+      - GPIO12
+      - GPIO0
+      - GPIO0
+      - GPIO6
+    * - TCK
+      - GPIO14
+      - GPIO2
+      - GPIO1
+      - GPIO12
+    * - TDO
+      - GPIO11
+      - GPIO9
+      - GPIO2
+      - GPIO7
+    * - TDI
+      - GPIO17
+      - GPIO1
+      - GPIO3
+      - GPIO13
+
 使用 CKLink + Eclipse 调试代码
 -------------------------------------------
 
diff --git a/tools/cklink_firmware/README.md b/tools/cklink_firmware/README.md
index 7e3eae09..d05895b2 100644
--- a/tools/cklink_firmware/README.md
+++ b/tools/cklink_firmware/README.md
@@ -30,4 +30,13 @@ CKLink driver version must be higher than 5.16.0. Download link is here.
 
 ## Debug with Eclipse
 
-See [BL_MCU_SDK DOC](https://bl-mcu-sdk.readthedocs.io/zh_CN/latest/get_started/debug.html)
\ No newline at end of file
+See [BL_MCU_SDK DOC](https://bl-mcu-sdk.readthedocs.io/zh_CN/latest/get_started/debug.html)
+
+## Default JTAG Pin
+
+|   CHIP/Pin    |  BL602/BL604  |  BL702/BL704/BL706 | BL616/BL618 |   BL808  |
+|:-------------:|:-------------:|:------------------:|:-----------:|:--------:|
+|TMS            |     GPIO12    |      GPIO0         |    GPIO0    |   GPIO6  |
+|TCK            |     GPIO14    |      GPIO2         |    GPIO1    |   GPIO12 |
+|TDO            |     GPIO11    |      GPIO9         |    GPIO2    |   GPIO7  |
+|TDI            |     GPIO17    |      GPIO1         |    GPIO3    |   GPIO13 |