diff --git a/aom/aomcx.h b/aom/aomcx.h
index bbf1775..cb33d02 100644
--- a/aom/aomcx.h
+++ b/aom/aomcx.h
@@ -291,11 +291,10 @@
   /*!\brief Codec control function to set number of tile columns.
    *
    * In encoding and decoding, AV1 allows an input image frame be partitioned
-   * into separated vertical tile columns, which can be encoded or decoded
+   * into separate vertical tile columns, which can be encoded or decoded
    * independently. This enables easy implementation of parallel encoding and
-   * decoding. This control requests the encoder to use column tiles in
-   * encoding an input frame, with number of tile columns (in Log2 unit) as
-   * the parameter:
+   * decoding. The parameter for this control describes the number of tile
+   * columns (in log2 units), which has a valid range of [0, 6]:
    *             0 = 1 tile column
    *             1 = 2 tile columns
    *             2 = 4 tile columns
@@ -312,16 +311,14 @@
   /*!\brief Codec control function to set number of tile rows.
    *
    * In encoding and decoding, AV1 allows an input image frame be partitioned
-   * into separated horizontal tile rows. Tile rows are encoded or decoded
-   * sequentially. Even though encoding/decoding of later tile rows depends on
-   * earlier ones, this allows the encoder to output data packets for tile rows
-   * prior to completely processing all tile rows in a frame, thereby reducing
-   * the latency in processing between input and output. The parameter
-   * for this control describes the number of tile rows, which has a valid
-   * range [0, 2]:
+   * into separate horizontal tile rows, which can be encoded or decoded
+   * independently. The parameter for this control describes the number of tile
+   * rows (in log2 units), which has a valid range of [0, 6]:
    *            0 = 1 tile row
    *            1 = 2 tile rows
    *            2 = 4 tile rows
+   *            .....
+   *            n = 2**n tile rows
    *
    * By default, the value is 0, i.e. one single row tile for entire image.
    */