diff --git a/README.md b/README.md
index c2828b0..41754fb 100644
--- a/README.md
+++ b/README.md
@@ -138,6 +138,8 @@ UniversalBle.onConnectionChanged = (String deviceId, BleConnectionState state) {
 
 ### Discovering Services
 
+After establishing a connection, you need to discover services. This method will discover all services and their characteristics.
+
 ```dart
 // Discover services of a specific device
 UniversalBle.discoverServices(deviceId);
@@ -145,6 +147,8 @@ UniversalBle.discoverServices(deviceId);
 
 ### Reading & Writing data
 
+You need to first [discover services](#discovering-services) before you are able to read and write to characteristics.
+
 ```dart
 // Read data from a characteristic
 UniversalBle.readValue(deviceId, serviceId, characteristicId);