diff --git a/content/firmwareapi/pycom/machine/sd.md b/content/firmwareapi/pycom/machine/sd.md
index b69965b..a2dddde 100644
--- a/content/firmwareapi/pycom/machine/sd.md
+++ b/content/firmwareapi/pycom/machine/sd.md
@@ -33,7 +33,7 @@ f = open('/sd/test.txt', 'w')
 f.write('Testing SD card write operations')
 f.close()
 f = open('/sd/test.txt', 'r')
-f.readall()
+f.read()
 f.close()
 ```