diff --git a/docs/io_tile.html b/docs/io_tile.html
index 53ee497..6adc683 100644
--- a/docs/io_tile.html
+++ b/docs/io_tile.html
@@ -103,7 +103,7 @@ For example the signal <tt>io_1/D_IN_0</tt> in IO tile (0, 5) can be seen as <tt
 <p>
 Each IO Tile has 2 <tt>NegClk</tt> configuration bits, suggesting that the
 clock signals can be inverted independently for the the two IO blocks in the
-tile. However, the Lattice tools refuse to pack to IO blocks with different block
+tile. However, the Lattice tools refuse to pack two IO blocks with different clock
 polarity into the same IO tile. In our tests we only managed to either set or clear
 both NegClk bits.
 </p>