diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..7cdb7d8
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,5 @@
+[run]
+omit =
+	psdr/duu.py
+	psdr/pgf.py
+	
diff --git a/.travis.yml b/.travis.yml
index 4bce021..74b5eab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,7 +40,7 @@ install:
 
 script:
  - pip freeze --local 
- - pytest --cov=psdr tests/
+ - pytest --cov=psdr --cov-config=.coveragerc tests/
 
 after_success:
  - if python --version | grep -c "3.7" ; then coveralls ; fi