diff --git a/libraries/SD/examples/SD_Test/SD_Test.ino b/libraries/SD/examples/SD_Test/SD_Test.ino
index b232ddd3bc1250b849c6f48068f0d163d113554f..d35b03f573c83ef170ddc8172c4cb4db33b3b42a 100644
--- a/libraries/SD/examples/SD_Test/SD_Test.ino
+++ b/libraries/SD/examples/SD_Test/SD_Test.ino
@@ -1,3 +1,17 @@
+/*
+ * Connect the SD card to the following pins:
+ *
+ * SD Card | ESP32
+ *    D2       -
+ *    D3       SS
+ *    CMD      MOSI
+ *    VSS      GND
+ *    VDD      3.3V
+ *    CLK      SCK
+ *    VSS      GND
+ *    D0       MISO
+ *    D1       -
+ */
 #include "FS.h"
 #include "SD.h"
 #include "SPI.h"
diff --git a/libraries/SD_MMC/examples/SDMMC_Test/SDMMC_Test.ino b/libraries/SD_MMC/examples/SDMMC_Test/SDMMC_Test.ino
index 5d1388ee1bef8d9bcb01d38f3731a05251078e7f..add5c01a83ebec9377cc3b76ed45013ddbd1dcd1 100644
--- a/libraries/SD_MMC/examples/SDMMC_Test/SDMMC_Test.ino
+++ b/libraries/SD_MMC/examples/SDMMC_Test/SDMMC_Test.ino
@@ -1,3 +1,18 @@
+/*
+ * Connect the SD card to the following pins:
+ *
+ * SD Card | ESP32
+ *    D2       12
+ *    D3       13
+ *    CMD      15
+ *    VSS      GND
+ *    VDD      3.3V
+ *    CLK      14
+ *    VSS      GND
+ *    D0       2  (add 1K pull up after flashing)
+ *    D1       4
+ */
+
 #include "FS.h"
 #include "SD_MMC.h"