[Keyboard] Update ergodash readme.md (#5092)

Clarification of Keys to Keymap note added

diff --git a/keyboards/ergodash/readme.md b/keyboards/ergodash/readme.md
index 1545b44624e0aa06c780adfe3aa53715981b2481..40d9fddfa5fdaa569ca06906eff1700716c6d642 100644 (file)
--- a/keyboards/ergodash/readme.md
+++ b/keyboards/ergodash/readme.md
@@ -22,4 +22,10 @@ Note:
 
 # Layout
 ![layout](https://github.com/omkbd/picture/blob/master/ergodash-layout.png)
+
+Layout Note:  
+- In thumb cluster, it is not possible to use all 5 positions as small keys. (as pictured)
+- The top 2 1u keys in the thumb cluster share the same connection.
+- 2u key (center) position shares with the lower 1u key position
+
 ![PCB](https://github.com/omkbd/picture/blob/master/Ergodash_PCB.jpg)