diff --git a/docs/library/esp.rst b/docs/library/esp.rst
index 040d62f769..34d3c278d9 100644
--- a/docs/library/esp.rst
+++ b/docs/library/esp.rst
@@ -39,3 +39,9 @@ Functions
 .. function:: flash_id()
 
     Read the device ID of the flash memory.
+
+.. function:: flash_read(byte_offset, length_or_buffer)
+
+.. function:: flash_write(byte_offset, bytes)
+
+.. function:: flash_erase(sector_no)