diff --git a/configs/esp32-core/README.txt b/configs/esp32-core/README.txt
index acdebf3cfc3..6d7e09c4b62 100644
--- a/configs/esp32-core/README.txt
+++ b/configs/esp32-core/README.txt
@@ -83,9 +83,27 @@ ESP32 Toolchain
 Memory Map
 ==========
 
-  Embedded Memory
-  ---------------
+  Address Mapping
+  ----------- ---------- ---------- --------------- ---------------
   BUS TYPE    START      LAST       DESCRIPTION     NOTES
+  ----------- ---------- ---------- --------------- ---------------
+              0x00000000 0x3F3FFFFF                 Reserved
+  Data        0x3F400000 0x3F7FFFFF External Memory
+  Data        0x3F800000 0x3FBFFFFF External Memory
+              0x3FC00000 0x3FEFFFFF                 Reserved
+  Data        0x3FF00000 0x3FF7FFFF Peripheral
+  Data        0x3FF80000 0x3FFFFFFF Embedded Memory
+  Instruction 0x40000000 0x400C1FFF Embedded Memory
+  Instruction 0x400C2000 0x40BFFFFF External Memory
+              0x40C00000 0x4FFFFFFF                 Reserved
+  Data /      0x50000000 0x50001FFF Embedded Memory
+  Instruction
+              0x50002000 0xFFFFFFFF                 Reserved
+
+  Embedded Memory
+  ----------- ---------- ---------- --------------- ---------------
+  BUS TYPE    START      LAST       DESCRIPTION     NOTES
+  ----------- ---------- ---------- --------------- ---------------
   Data        0x3ff80000 0x3ff81fff RTC FAST Memory PRO_CPU Only
               0x3ff82000 0x3ff8ffff                 Reserved
   Data        0x3ff90000 0x3ff9ffff Internal ROM 1
@@ -94,8 +112,9 @@ Memory Map
   Data        0x3ffe0000 0x3fffffff Internal SRAM 1 DMA
 
   Boundary Address
-  ----------------
+  ----------- ---------- ---------- --------------- ---------------
   BUS TYPE    START      LAST       DESCRIPTION     NOTES
+  ----------- ---------- ---------- --------------- ---------------
   Instruction 0x40000000 0x40007fff Internal ROM 0  Remap
   Instruction 0x40008000 0x4005ffff Internal ROM 0
               0x40060000 0x4006ffff                 Reserved
@@ -109,8 +128,9 @@ Memory Map
   Instruction
 
   External Memory
-  ---------------
+  ----------- ---------- ---------- --------------- ---------------
   BUS TYPE    START      LAST       DESCRIPTION     NOTES
+  ----------- ---------- ---------- --------------- ---------------
   Data        0x3f400000 0x3f7fffff External Flash  Read
   Data        0x3f800000 0x3fbfffff External SRAM   Read and Write
 
@@ -119,14 +139,15 @@ Memory Map
   Instruction 0x400c2000 0x40bfffff 11512 KB External Flash Read
 
   Linker Segments
-  ---------------
-  DESCRIPTION        START        END        ATTR LINKER SEGMENT NAME
-  FLASH mapped data: 0x3f400010 - 0x3fc00010  R   dram_0_seg
-  COMMON data RAM:   0x3ffb0000 - 0x40000000  RW  dram_0_seg (NOTE 1,2)
-  IRAM for PRO cpu:  0x40080000 - 0x400a0000  RX  iram0_0_seg
-  RTC fast memory:   0x400c0000 - 0x400c2000  RWX rtc_iram_seg
-  FLASH:             0x400d0018 - 0x40400018  RX  iram0_2_seg (actually FLASH)
-  RTC slow memory:   0x50000000 - 0x50001000  RW  rtc_slow_seg (NOTE 3)
+  ------------------ ---------- ---------- ---- ----------------------------
+  DESCRIPTION        START      END        ATTR LINKER SEGMENT NAME
+  ------------------ ---------- ---------- ---- ----------------------------
+  FLASH mapped data: 0x3f400010 0x3fc00010  R   dram_0_seg
+  COMMON data RAM:   0x3ffb0000 0x40000000  RW  dram_0_seg (NOTE 1,2)
+  IRAM for PRO cpu:  0x40080000 0x400a0000  RX  iram0_0_seg
+  RTC fast memory:   0x400c0000 0x400c2000  RWX rtc_iram_seg
+  FLASH:             0x400d0018 0x40400018  RX  iram0_2_seg (actually FLASH)
+  RTC slow memory:   0x50000000 0x50001000  RW  rtc_slow_seg (NOTE 3)
 
   NOTE 1: Linker script will reserved space at the beginning of the segment
           for BT and at the end for trace memory.