diff --git a/ch4_rf_point_positioning/__init__.py b/ch4_rf_point_positioning/__init__.py
index 18ebd9c..615353b 100644
--- a/ch4_rf_point_positioning/__init__.py
+++ b/ch4_rf_point_positioning/__init__.py
@@ -5,7 +5,7 @@
 of "Principles of Indoor Positioning and Indoor Navigation".
 
 Examples:
-    - TOA/RSS positioning with I-WLS
+    - TOA/RSS positioning with iterative LS, and WLS where a covariance is given
     - TDOA positioning with closed-form algorithms (Fang, Chan)
     - AOA positioning
     - RF challenges and limitations