diff --git a/docs/en/api-guides/memory-types.rst b/docs/en/api-guides/memory-types.rst
index d7c94fc6b4..3a0d8e0121 100644
--- a/docs/en/api-guides/memory-types.rst
+++ b/docs/en/api-guides/memory-types.rst
@@ -175,9 +175,9 @@ The ``DRAM_ATTR`` attribute can be used to force constants from DROM into the :r
 
     .. only:: esp32
 
-        RTC FAST memory can only be accessed by the PRO CPU.
+        In single core mode (:ref:`CONFIG_FREERTOS_UNICORE`), remaining RTC FAST memory is be added to the heap, unless the option :ref:`CONFIG_ESP_SYSTEM_ALLOW_RTC_FAST_MEM_AS_HEAP` is disabled. This memory can be used interchangeably with :ref:`DRAM`, but is slightly slower to access and not DMA capable.
 
-        In single core mode, remaining RTC FAST memory is added to the heap unless the option :ref:`CONFIG_ESP_SYSTEM_ALLOW_RTC_FAST_MEM_AS_HEAP` is disabled. This memory can be used interchangeably with :ref:`DRAM`, but is slightly slower to access and not DMA capable.
+        This option is not available in dual-core mode because on ESP32, RTC FAST memory can only be accessed by the PRO CPU.
 
     .. only:: not esp32