diff --git a/README.md b/README.md
index e8ab566..87a48ae 100644
--- a/README.md
+++ b/README.md
@@ -173,7 +173,7 @@ Tested Combinations Arduino
 
 | Device             | 4 MHz  | 8 MHz  | 9.6 MHz | 12 MHz | 16 MHz | 20 Mhz |
 | -------------       |:-------:| :-----: | :------: | :----:| :---:| :---:|
-| Arduino Uno |       |   X*   |         |       |  X   |    |
+| Arduino Uno |       |   X   |         |       |  X   |    |
 | Arduino Mega 2560 |        |        |        |       |    X    |    |
 | Arduino Nano |        |        |        |       |    X    |    |