diff --git a/readme.md b/readme.md
index d133594..4d4f024 100644
--- a/readme.md
+++ b/readme.md
@@ -33,6 +33,7 @@ g1 --> Ascent
 %%{init: {'theme':'neutral'}}%%
 flowchart LR;
 
+batt[Battery]
 t[Teensy 4.1]
 imu[Inertial Measurement Unit]
 b[Barometer]
@@ -40,12 +41,14 @@ b[Barometer]
 subgraph Propulsion
 r[Roll Motor]
 p[Pitch Motor]
+e[Engine Ignitor]
 end
 
 
 imu & b -. I2C .-> t
+batt == 3.3V ==> t
 
-t -- PWM --> r & p
+t -- PWM --> r & p & e
 
 ```