diff --git a/docs/adlink_ipi_arm.md b/docs/adlink_ipi_arm.md
index cfb14fe..69513bd 100755
--- a/docs/adlink_ipi_arm.md
+++ b/docs/adlink_ipi_arm.md
@@ -26,7 +26,7 @@ Up to 4GB DDR3L at 1066/1333 MHz,  32 GB eMMC
 |                              | SPI MOSI  |     19      |     20      |    GND    |                              |
 |                              | SPI MISO  |     21      |     22      |   GPIO    |             122              |
 |                              | SPI SCLK  |     23      |     24      |  SPI CS0  |                              |
-|                              |    GND    |     25      |     26      |  SPI CS1  |                              |
+|                              |    GND    |     25      |     26      |      N/A  |                              |
 |                              | I2C_1 SDA |     27      |     28      | I2C_1 SCL |                              |
 |             496              | GPIO/PWM  |     29      |     30      |    GND    |                              |
 |             497              | GPIO/PWM  |     31      |     32      | GPIO/PWM  |             498              |
@@ -35,4 +35,4 @@ Up to 4GB DDR3L at 1066/1333 MHz,  32 GB eMMC
 |             502              | GPIO/PWM  |     37      |     38      | GPIO/PWM  |             503              |
 |                              |    GND    |     39      |     40      | GPIO/PWM  |             504              |
 
-
+**Note**: N/A: FUnciton is Not support