diff --git a/MuonSpectrometer/MuonAlignment/MuonAlignmentData/MuonAlignmentData/sTGCAsBuiltData2.h b/MuonSpectrometer/MuonAlignment/MuonAlignmentData/MuonAlignmentData/sTGCAsBuiltData2.h
index b747d2feb48672268c07788c7815a2a09551feb1..94e0ab791861e9b7d9cfcf46caa676b866b02648 100644
--- a/MuonSpectrometer/MuonAlignment/MuonAlignmentData/MuonAlignmentData/sTGCAsBuiltData2.h
+++ b/MuonSpectrometer/MuonAlignment/MuonAlignmentData/MuonAlignmentData/sTGCAsBuiltData2.h
@@ -12,11 +12,17 @@
 #include "GeoPrimitives/GeoPrimitives.h"
 
 /**
- * Container class that stores the as built parameters  of the sTgcs. 
- * Each gasGap has its own set of corrections. 
-*/
-
-
+ * @class sTGCAsBuiltData2
+ *
+ * @brief Class holding the sTGC as built conditions data and applying it. The model consists of four parameters:
+ *         - offset: shift of the strip layer in the precission coordinate
+ *         - rotation: rotation of the strip plane around the origin of the local coordinate system
+ *         - scale: correction to the pitch of the strips.
+ *         - nonPara: correction to the non parallelism of the strips
+ * 
+ *        The as built parameters are applied in athenas local coordinate system. The parameters are expected in units of um and mrad
+ *
+ */
 
 class sTGCAsBuiltData2: public AthMessaging {
     public:
@@ -24,11 +30,13 @@ class sTGCAsBuiltData2: public AthMessaging {
         // returns the local positon corrected for the as built parameters
         Amg::Vector2D correctPosition(const Identifier& channelId, const Amg::Vector2D& pos) const;
         // Set the parameters of the as build model (shift, rotation, scale)
-        
+
+
         struct Parameters{
           double offset {0.};
           double rotation{0.};
           double scale{0.};
+          double nonPara {0.};
         };
         
         StatusCode setParameters(const Identifier& gasGapId, const Parameters& pars);
diff --git a/MuonSpectrometer/MuonAlignment/MuonAlignmentData/src/sTGCAsBuiltData2.cxx b/MuonSpectrometer/MuonAlignment/MuonAlignmentData/src/sTGCAsBuiltData2.cxx
index 700905f2851f9c28ef46821c39c6766c0b6ce6de..b98814e31b7fc1a14e3ead14797de1be008d799d 100644
--- a/MuonSpectrometer/MuonAlignment/MuonAlignmentData/src/sTGCAsBuiltData2.cxx
+++ b/MuonSpectrometer/MuonAlignment/MuonAlignmentData/src/sTGCAsBuiltData2.cxx
@@ -19,7 +19,7 @@ Amg::Vector2D sTGCAsBuiltData2::correctPosition(const Identifier& channelId, con
     Amg::Vector2D correctedPos = pos;
     Parameters pars = par_itr->second;
     constexpr double convScale = 1.e-3; // parameters are stored in um and mrad therefore dividing by 1000
-    correctedPos.x() = pos.x() + (pars.offset * convScale  + pars.rotation *convScale * pos.y() + pars.scale*convScale*pos.x()); 
+    correctedPos.x() = pos.x() + (pars.offset * convScale  + pars.rotation *convScale * pos.y() + pars.scale*convScale*pos.x() + pars.nonPara * convScale * convScale * pos.x()*pos.y()); 
     return correctedPos;
 }
 
diff --git a/MuonSpectrometer/MuonConditions/MuonCondGeneral/MuonCondAlg/src/sTGCAsBuiltCondAlg2.cxx b/MuonSpectrometer/MuonConditions/MuonCondGeneral/MuonCondAlg/src/sTGCAsBuiltCondAlg2.cxx
index cdd848b395b742d06733164646e2ee1952dee65e..2c3c7718ae6d2039c99811274d784786db5cc0de 100644
--- a/MuonSpectrometer/MuonConditions/MuonCondGeneral/MuonCondAlg/src/sTGCAsBuiltCondAlg2.cxx
+++ b/MuonSpectrometer/MuonConditions/MuonCondGeneral/MuonCondAlg/src/sTGCAsBuiltCondAlg2.cxx
@@ -92,6 +92,7 @@ StatusCode sTGCAsBuiltCondAlg2::parseDataFromJSON(const nlohmann::json& lines,
         pars.offset = line["offset"];
         pars.rotation = line["rotation"];
         pars.scale = line["scale"];
+        pars.nonPara = line["nonPara"];
 
         ATH_CHECK(effiData.setParameters(id, pars));
     }