diff --git a/targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H747xI/TARGET_PORTENTA_H7/PeripheralPins.c b/targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H747xI/TARGET_PORTENTA_H7/PeripheralPins.c
index 62def5b8a74..1fcb23cb74e 100644
--- a/targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H747xI/TARGET_PORTENTA_H7/PeripheralPins.c
+++ b/targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H747xI/TARGET_PORTENTA_H7/PeripheralPins.c
@@ -146,34 +146,34 @@ MBED_WEAK const PinMap PinMap_DAC[] = {
 //*** I2C ***
 
 MBED_WEAK const PinMap PinMap_I2C_SDA[] = {
-    {PB_7,       I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
+    {PB_7,       I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, // Connected to I2C1_SDA
     {PB_7_ALT0,  I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C4)},
-    {PB_9,       I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
+    {PB_9,       I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, // Connected to I2S2_WS
     {PB_9_ALT0,  I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C4)},
     {PB_11,      I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)}, // Connected to ULPI_D4
     {PC_9,       I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, // Connected to SDIO1_D1
-    {PD_13,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)},
+    {PD_13,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)}, // Connected to U2_HOLD/SO3
     {PF_0,       I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)}, // Connected to FMC_A0
     {PF_15,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)}, // Connected to FMC_A9
     {PH_5,       I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)}, // Connected to FMC_SDNWE
-    {PH_8,       I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, // Connected to FMC_D16
-    {PH_12,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)}, // Connected to FMC_D20
+    {PH_8,       I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, // Connected to I2C3_SDA
+    {PH_12,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)}, // Connected to I2C4_SDA
     {NC, NC, 0}
 };
 
 MBED_WEAK const PinMap PinMap_I2C_SCL[] = {
-    {PA_8,       I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, // Connected to CEC_CK/MCO1
-    {PB_6,       I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, // Connected to HDMI_CEC
-    {PB_6_ALT0,  I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C4)}, // Connected to HDMI_CEC
-    {PB_8,       I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
+    {PA_8,       I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, // Connected to PWM0
+    {PB_6,       I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, // Connected to I2C1_SCL
+    {PB_6_ALT0,  I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C4)},
+    {PB_8,       I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, // Connected to CAN_RX
     {PB_8_ALT0,  I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C4)},
     {PB_10,      I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)}, // Connected to ULPI_D3
-    {PD_12,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)},
+    {PD_12,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)}, // Connected to U2_SO/SO1
     {PF_1,       I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)}, // Connected to FMC_A1
     {PF_14,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)}, // Connected to FMC_A8
     {PH_4,       I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)}, // Connected to ULPI_NXT
-    {PH_7,       I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, // Connected to FMC_SDCKE1
-    {PH_11,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)}, // Connected to FMC_D19
+    {PH_7,       I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)}, // Connected to I2C3_SCL
+    {PH_11,      I2C_4, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C4)}, // Connected to I2C4_SCL
     {NC, NC, 0}
 };