diff --git a/src/BeamAdapter/component/mapping/BeamLengthMapping.inl b/src/BeamAdapter/component/mapping/BeamLengthMapping.inl
index c8e89d8e..f894c1ab 100644
--- a/src/BeamAdapter/component/mapping/BeamLengthMapping.inl
+++ b/src/BeamAdapter/component/mapping/BeamLengthMapping.inl
@@ -455,7 +455,7 @@ void BeamLengthMapping< TIn, TOut>::applyDJT(const MechanicalParams* mparams, co
     for (unsigned int i=0; i<s; i++)
     {
         // force in compression (>0) can lead to negative eigen values in geometric stiffness
-        // this results in a undefinite implicit matrix that causes instabilies
+        // this results in an undefinite implicit matrix that causes instabilities
         // if stabilized GS (geometricStiffness==2) -> keep only force in extension
         if( childForce[i][0] < 0 || geometricStiffness==1 )
         {
@@ -611,7 +611,7 @@ void BeamLengthMapping<TIn, TOut>::updateK(const core::MechanicalParams* mparams
     for (unsigned int i=0; i<s; i++)
     {
         // force in compression (>0) can lead to negative eigen values in geometric stiffness
-        // this results in a undefinite implicit matrix that causes instabilies
+        // this results in an undefinite implicit matrix that causes instabilities
         // if stabilized GS (geometricStiffness==2) -> keep only force in extension
         if( childForce[i][0] < 0 || geometricStiffness==1 )
         {