diff --git a/components/ulp/ulp_common/ulp_adc.c b/components/ulp/ulp_common/ulp_adc.c
index cf9ffa1c6f..21fbc1e93c 100644
--- a/components/ulp/ulp_common/ulp_adc.c
+++ b/components/ulp/ulp_common/ulp_adc.c
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -15,38 +15,37 @@
 #include "esp_private/adc_share_hw_ctrl.h"
 
 static const char *TAG = "ulp_adc";
-static adc_oneshot_unit_handle_t s_adc1_handle = NULL;
+static adc_oneshot_unit_handle_t s_adc_handle = NULL;
 
 esp_err_t ulp_adc_init(const ulp_adc_cfg_t *cfg)
 {
     esp_err_t ret = ESP_OK;
 
     ESP_RETURN_ON_FALSE(cfg, ESP_ERR_INVALID_ARG, TAG, "cfg == NULL");
-    ESP_RETURN_ON_FALSE(cfg->adc_n == ADC_UNIT_1, ESP_ERR_INVALID_ARG, TAG, "Only ADC_UNIT_1 is supported for now");
 
     //-------------ADC1 Init---------------//
-    adc_oneshot_unit_init_cfg_t init_config1 = {
+    adc_oneshot_unit_init_cfg_t init_config = {
         .unit_id = cfg->adc_n,
         .ulp_mode = cfg->ulp_mode,
     };
 
-    if (init_config1.ulp_mode == ADC_ULP_MODE_DISABLE) {
+    if (init_config.ulp_mode == ADC_ULP_MODE_DISABLE) {
         /* Default to RISCV for backward compatibility */
         ESP_LOGI(TAG, "No ulp mode specified in cfg struct, default to riscv");
-        init_config1.ulp_mode = ADC_ULP_MODE_RISCV;
+        init_config.ulp_mode = ADC_ULP_MODE_RISCV;
     }
 
-    ret = adc_oneshot_new_unit(&init_config1, &s_adc1_handle);
+    ret = adc_oneshot_new_unit(&init_config, &s_adc_handle);
     if (ret != ESP_OK) {
         return ret;
     }
 
-    //-------------ADC1 Config---------------//
+    //-------------ADC Config---------------//
     adc_oneshot_chan_cfg_t config = {
         .bitwidth = cfg->width,
         .atten = cfg->atten,
     };
-    ret = adc_oneshot_config_channel(s_adc1_handle, cfg->channel, &config);
+    ret = adc_oneshot_config_channel(s_adc_handle, cfg->channel, &config);
     if (ret != ESP_OK) {
         return ret;
     }
@@ -62,5 +61,5 @@ esp_err_t ulp_adc_init(const ulp_adc_cfg_t *cfg)
 esp_err_t ulp_adc_deinit(void)
 {
     // No need to check for null-pointer and stuff, oneshot driver already does that
-    return adc_oneshot_del_unit(s_adc1_handle);
+    return adc_oneshot_del_unit(s_adc_handle);
 }
diff --git a/components/ulp/ulp_riscv/ulp_core/include/ulp_riscv_adc_ulp_core.h b/components/ulp/ulp_riscv/ulp_core/include/ulp_riscv_adc_ulp_core.h
index 5d189109f6..8c59396004 100644
--- a/components/ulp/ulp_riscv/ulp_core/include/ulp_riscv_adc_ulp_core.h
+++ b/components/ulp/ulp_riscv/ulp_core/include/ulp_riscv_adc_ulp_core.h
@@ -18,8 +18,10 @@ extern "C" {
  *
  * @note Will block until the conversion is completed
  *
- * @note ADC should be initilized for ULP by main CPU by calling ulp_riscv_adc_init()
+ * @note ADC should be initialized for ULP by main CPU by calling ulp_riscv_adc_init()
  *       before calling this.
+ * @note When using ADC_UNIT_2, the caller must ensure that no other module (e.g., Wi-Fi or BT)
+ *       is accessing the ADC, as conflicts may lead to undefined behavior.
  *
  * @param      adc_n   ADC unit.
  * @param      channel ADC channel number.