diff --git a/README.md b/README.md
index 58a6df2..2ca2687 100644
--- a/README.md
+++ b/README.md
@@ -17,8 +17,8 @@ the setup is pretty simple
 the bme280 sensor is connected like this:
   * sensor +     ---> esp 3.3v
   * sensor gnd   ---> esp gnd
-  * sensor SCL   ---> esp SCL (d1/gpio 5)
-  * sensor SDA   ---> esp SDA (d2/gpio 4)
+  * sensor SCK   ---> esp SCL (d1/gpio 5)
+  * sensor SDI   ---> esp SDA (d2/gpio 4)
 
 For the solar charging i wanted to stay as close to a gardenlight as possible - so i am using a 5v 500mAh solar panel
 and a lm4056 breakout board to charge 4x 1.2v NIMH rechargable batteries, which powers the station.  Here is a schematic i got off the net: