diff --git a/README.md b/README.md
index 951496d..0352eda 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,7 @@ The IP address is set to dynamic (DHCP) after initial flash of the NodeMCU.
 Sample schematics (no NodeMCU pins defined in there)
 
 ![Sample schematics](pic/schematics.png)
+Please note the letters "R" "G" "B" "W" "S" are also documented in the table above. These are the german shorts of the colors red green blue white black (schwarz).
 
 ![Prototype](pic/prototype.jpeg)