Degenerations of finite-dimensional modules are given by extensions

Let A be a finite-dimensional k-algebra over algebraically closed field k a nd mod A be the category of finite-dimensional left A-modules. We show that a module M in mod A degenerates to another module N in mod A if and only i f there is an exact sequence 0 --> N --> M + Z --> Z --> 0 in mod A for som e A-module Z. Moreover, we give a description of minimal degenerations of f inite-dimensional A-modules.