diff --git a/mgpro/mgpro.py b/mgpro/mgpro.py
index ea71d2677db77e41c06e0b8c0823d7c2225f014e..976b62320a257e945a74d1d0f94a715946c3c475 100644
--- a/mgpro/mgpro.py
+++ b/mgpro/mgpro.py
@@ -209,7 +209,7 @@ class mgmat(object):
         if self.pcot is not None:
             line = plt.plot(self.eff_freq, self.eff_freq*self.pcot[0]+self.pcot[1], 'k', label=r"Z = {:.2f}m".format(self.pcot[0]))
             plt.legend()
-        plt.ylabel('Amplitude')
+        plt.ylabel('ln(Amp)')
         plt.xlabel('Angular frequency')
         plt.show()
 
diff --git a/setup.py b/setup.py
index a899dd7f8a3ae54ea12fc0620e019bfcf4652beb..d4dff7ac6a9d53dd2cb298d9d6f0f16e4f7490f2 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@ packages = find_packages()
 with open("README.md", "r") as fh:
     long_description = fh.read()
 
-VERSION = "0.1.17"
+VERSION = "0.1.18"
 setup(name='mgpro',
       version=VERSION,
       author='Mijian Xu',