diff --git a/components/sdmmc/include/sdmmc_cmd.h b/components/sdmmc/include/sdmmc_cmd.h
index 0510defd7bd6..328fd56eacd7 100644
--- a/components/sdmmc/include/sdmmc_cmd.h
+++ b/components/sdmmc/include/sdmmc_cmd.h
@@ -283,7 +283,7 @@ esp_err_t sdmmc_io_read_blocks(sdmmc_card_t* card, uint32_t function,
  * @param addr  byte address within IO function where writing starts
  * @param src  data to be written. Aligned to 4 byte boundary, and also cache line size if the buffer is behind the
  *             cache.
- * @param size  number of bytes to read, must be divisible by the card block
+ * @param size  number of bytes to write, must be divisible by the card block
  *              size.
  * @return
  *      - ESP_OK on success