diff --git a/src/ui/qgisapp.ui b/src/ui/qgisapp.ui
index 15b17a795638..d79d92e86bcc 100644
--- a/src/ui/qgisapp.ui
+++ b/src/ui/qgisapp.ui
@@ -1178,6 +1178,12 @@ Shift+O to turn segments into straight or curve lines.</string>
    <property name="text">
     <string>Trim/Extend Feature</string>
    </property>
+   <property name="toolTip">
+    <string>Trim/Extend Feature
+- Click to set the reference segment
+- Click on another segment to trim it or extend it to the reference segment (Use Shift or Ctrl to keep the reference segment active)
+Note : Segment snapping must be enabled in the snapping Toolbar</string>
+   </property>
   </action>
   <action name="mActionSnappingOptions">
    <property name="text">