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-rw-r--r--docs/library/machine.SDCard.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/library/machine.SDCard.rst b/docs/library/machine.SDCard.rst
index cf86b1fcb..b1cf42ec0 100644
--- a/docs/library/machine.SDCard.rst
+++ b/docs/library/machine.SDCard.rst
@@ -23,7 +23,7 @@ arguments that might need to be set in order to use either a non-standard slot
or a non-standard pin assignment. The exact subset of arguments supported will
vary from platform to platform.
-.. class:: SDCard(slot=1, width=1, cd=None, wp=None, sck=None, miso=None, mosi=None, cs=None)
+.. class:: SDCard(slot=1, width=1, cd=None, wp=None, sck=None, miso=None, mosi=None, cs=None, freq=20000000)
This class provides access to SD or MMC storage cards using either
a dedicated SD/MMC interface hardware or through an SPI channel.
@@ -50,6 +50,8 @@ vary from platform to platform.
- *mosi* can be used to specify an SPI mosi pin.
- *cs* can be used to specify an SPI chip select pin.
+
+ - *freq* selects the SD/MMC interface frequency in Hz (only supported on the ESP32).
Implementation-specific details
-------------------------------