diff --git a/examples/examples-custom-boards/lyrat-mini/sd/sd.ino b/examples/examples-custom-boards/lyrat-mini/sd/sd.ino
index 01cbda006..c847c29b0 100644
--- a/examples/examples-custom-boards/lyrat-mini/sd/sd.ino
+++ b/examples/examples-custom-boards/lyrat-mini/sd/sd.ino
@@ -27,24 +27,27 @@ void setup(void) {
   // setup SPI
   SPI.begin(PIN_SD_CARD_CLK, PIN_SD_CARD_MISO, PIN_SD_CARD_MOSI, PIN_SD_CARD_CS);
 
-  // Determin if there is an SD card
+  // Optionally determine if there is an SD card
   pinMode(PIN_SD_CARD_DET, INPUT);
   if (digitalRead(PIN_SD_CARD_DET)!=0){
     Serial.println("No SD Card detected");
   }
 
-  // Setup SD and open file
+  // Open SD library
   if (!SD.begin(PIN_SD_CARD_CS)){
     Serial.println("SD.begin failed");
     while(true);
   }
 
+  // Open an existing file
   auto file = SD.open("/audio8000.raw", FILE_READ);
   if (!file){
     Serial.println("file open failed");
     while(true);
   }
 
+  file.close();
+
   Serial.println("Success");
 }
 
diff --git a/examples/examples-custom-boards/lyrat-mini/sdmmc/sdmmc.ino b/examples/examples-custom-boards/lyrat-mini/sdmmc/sdmmc.ino
index c3b8ad170..4b1901019 100644
--- a/examples/examples-custom-boards/lyrat-mini/sdmmc/sdmmc.ino
+++ b/examples/examples-custom-boards/lyrat-mini/sdmmc/sdmmc.ino
@@ -24,7 +24,7 @@ void setup(void) {
   pinMode(PIN_SD_CARD_POWER, OUTPUT);
   digitalWrite(PIN_SD_CARD_POWER, LOW);
 
-  // Optionally: Determin if there is an SD card
+  // Optionally: Determine if there is an SD card
   pinMode(PIN_SD_CARD_DET, INPUT);
   if (digitalRead(PIN_SD_CARD_DET)!=0){
     Serial.println("No SD Card detected");
@@ -36,12 +36,15 @@ void setup(void) {
     while(true);
   }
 
+  // open an existing file
   auto file = SD_MMC.open("/test.mp3", FILE_READ);
   if (!file){
     Serial.println("file open failed");
     while(true);
   }
 
+  file.close();
+
   Serial.println("Success");
 }