Clarify angle definitions

edm4hep.yaml

@@ -513,8 +513,8 @@ datatypes:
       - float time [ns] // time of the hit
       - float eDep [GeV] // energy deposited by the hit
       - float eDepError [GeV] // error on eDep
-      - float wireStereoAngle // stereo angle of the sensitive wire (use it together with wireAzimuthalAngle to get the wire direction)
-      - float wireAzimuthalAngle // azimuthal angle of the sensitive wire (use it together with wireStereoAngle to get the wire direction)
+      - float wireStereoAngle // angle between the sensitive wire axis and the drift chamber axis (usually the z-axis) - use it together with wireAzimuthalAngle to get the wire direction
+      - float wireAzimuthalAngle // azimuthal angle at the middle of the sensitive wire - use it together with wireStereoAngle to get the wire direction
       - edm4hep::Vector3d position [mm] // point on the sensitive wire which is closest to the hit (center of the circle)
       - double positionAlongWireError [mm] // error on the hit position along the wire direction
       - float distanceToWire [mm] // distance between the hit and the wire (radius of the circle)