diff --git a/Blueprints.md b/Blueprints.md
index e31c319..539b7ac 100644
--- a/Blueprints.md
+++ b/Blueprints.md
@@ -22,4 +22,19 @@ The goal is to create reliable and responsive lighting that only turns on when i
 - ✅ Smooth fade in/out using transition time
 - ✅ Adjustable delay before turning lights off
 - ✅ Optional time schedule
-- ✅ Supports multiple lights
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+- ✅ Supports multiple lights
+
+## How it Works
+### Light ON
+
+The light turns on when all of the following conditions are true:
+
+Presence is detected
+Illuminance is below the configured lux threshold
+(Optional) Current time is inside the configured time window
+Light OFF
+
+The light turns off when:
+
+Presence is no longer detected
+The configured off-delay has expired
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