∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {J : CategoryTheory.GrothendieckTopology C}
  {R : CategoryTheory.Sheaf J RingCat} [inst_1 : J.HasSheafCompose (CategoryTheory.forget₂ RingCat AddCommGrpCat)]
  {M N : SheafOfModules R} (s : M.sections) (p : M ⟶ N),
  CategoryTheory.CategoryStruct.comp (M.unitHomEquiv.symm s) p = N.unitHomEquiv.symm (SheafOfModules.sectionsMap p s)