diff --git a/components/esp_driver_i2s/i2s_common.c b/components/esp_driver_i2s/i2s_common.c
index 73d1e6b58ed..fc95f9e39ae 100644
--- a/components/esp_driver_i2s/i2s_common.c
+++ b/components/esp_driver_i2s/i2s_common.c
@@ -968,7 +968,7 @@ esp_err_t i2s_check_set_mclk(i2s_chan_handle_t handle, i2s_port_t id, int gpio_n
     if (g_i2s.controller[id]->mclk_out_hdl == NULL) {
         i2s_output_gpio_reserve(handle, gpio_num);
         soc_clkout_sig_id_t clkout_sig = is_apll ? CLKOUT_SIG_APLL : (is_i2s0 ? CLKOUT_SIG_I2S0 : CLKOUT_SIG_I2S1);
-        ESP_RETURN_ON_ERROR(esp_clock_output_start(clkout_sig, gpio_num, &(g_i2s.controller[id]->mclk_out_hdl)), TAG, "mclk configure failed");
+        ESP_RETURN_ON_ERROR(esp_clock_output_start(clkout_sig, gpio_num, &(g_i2s.controller[id]->mclk_out_hdl)), TAG, "mclk configure failed, note: only gpio 0/1/3 are supported on esp32");
     }
 #else
     ESP_RETURN_ON_FALSE(GPIO_IS_VALID_GPIO(gpio_num), ESP_ERR_INVALID_ARG, TAG, "mck_io_num invalid");
diff --git a/docs/en/api-reference/peripherals/i2s.rst b/docs/en/api-reference/peripherals/i2s.rst
index 2e9fe5c02de..83e430223fd 100644
--- a/docs/en/api-reference/peripherals/i2s.rst
+++ b/docs/en/api-reference/peripherals/i2s.rst
@@ -103,6 +103,12 @@ Clock Terminology
 
     Normally, MCLK should be the multiple of ``sample rate`` and BCLK at the same time. The field :cpp:member:`i2s_std_clk_config_t::mclk_multiple` indicates the multiple of MCLK to the ``sample rate``. In most cases, ``I2S_MCLK_MULTIPLE_256`` should be enough. However, if ``slot_bit_width`` is set to ``I2S_SLOT_BIT_WIDTH_24BIT``, to keep MCLK a multiple to the BCLK, :cpp:member:`i2s_std_clk_config_t::mclk_multiple` should be set to multiples that are divisible by 3 such as ``I2S_MCLK_MULTIPLE_384``. Otherwise, WS will be inaccurate.
 
+.. only:: esp32
+
+    .. note::
+
+        On ESP32, the MCLK pin must use GPIO0, GPIO1, or GPIO3. The other clock pins (e.g., BCLK, WS) can use any valid GPIO. Note that GPIO0 is generally not recommended for other functions because it is a strapping pin.
+
 .. _i2s-communication-mode:
 
 I2S Communication Mode
diff --git a/docs/zh_CN/api-reference/peripherals/i2s.rst b/docs/zh_CN/api-reference/peripherals/i2s.rst
index 539e7612a26..0c2ef342050 100644
--- a/docs/zh_CN/api-reference/peripherals/i2s.rst
+++ b/docs/zh_CN/api-reference/peripherals/i2s.rst
@@ -103,6 +103,12 @@ I2S 时钟
 
     通常，MCLK 应该同时是 ``采样率`` 和 BCLK 的倍数。字段 :cpp:member:`i2s_std_clk_config_t::mclk_multiple` 表示 MCLK 相对于 ``采样率`` 的倍数。在大多数情况下，将其设置为 ``I2S_MCLK_MULTIPLE_256`` 即可。但如果 ``slot_bit_width`` 被设置为 ``I2S_SLOT_BIT_WIDTH_24BIT``，为了保证 MCLK 是 BCLK 的整数倍，应该将 :cpp:member:`i2s_std_clk_config_t::mclk_multiple` 设置为能被 3 整除的倍数，如 ``I2S_MCLK_MULTIPLE_384``，否则 WS 会不精准。
 
+.. only:: esp32
+
+    .. note::
+
+        在ESP32上，MCLK 管脚必须使用 GPIO0、GPIO1 或 GPIO3 管脚。其他的时钟管脚可以使用任意的 GPIO。注意，由于 GPIO0 为 Strapping 管脚，一般不推荐用作其他功能。
+
 .. _i2s-communication-mode:
 
 I2S 通信模式
diff --git a/examples/peripherals/i2c/i2c_basic/README.md b/examples/peripherals/i2c/i2c_basic/README.md
index 700413ff2e0..36549ea6cf9 100644
--- a/examples/peripherals/i2c/i2c_basic/README.md
+++ b/examples/peripherals/i2c/i2c_basic/README.md
@@ -15,7 +15,7 @@ If you have a new I2C application to go (for example, read the temperature data
 
 ### Hardware Required
 
-To run this example, you should have an Espressif development board based on a chip listed in supported targets as well as a MPU9250. MPU9250 is a inertial measurement unit, which contains a accelerometer, gyroscope as well as a magnetometer, for more information about it, you can read the [datasheet of the MPU9250 sensor](https://invensense.tdk.com/wp-content/uploads/2015/02/PS-MPU-9250A-01-v1.1.pdf).
+To run this example, you should have an Espressif development board based on a chip listed in supported targets as well as a MPU9250. MPU9250 is a inertial measurement unit, which contains a accelerometer, gyroscope as well as a magnetometer, for more information about it, you can read the [datasheet of the MPU9250 sensor](https://download.mikroe.com/documents/datasheets/PS-MPU-9250A-01-v1.1.pdf).
 
 #### Pin Assignment