diff --git a/requirements_continuous_integration.txt b/requirements_continuous_integration.txt
index 4db5aec50c2da1a8a60fd066d8a3fbecb099bbcc..bd06a1994e6f71cb36f5a2137708f439d5c07131 100644
--- a/requirements_continuous_integration.txt
+++ b/requirements_continuous_integration.txt
@@ -1,3 +1,4 @@
+# contains all additional requirements to run the ```tox .``` in addition to requirements_dev.txt for ```tox -e py37,py37```
 bumpversion==0.5.3
 wheel==0.32.1
 watchdog==0.9.0
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 6be61810438ff1179d7fb83400326ec386ca6e09..374c6d93a72513b0d470006d199f6b558d298b66 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,4 +1,4 @@
-# contains
+# contains all requirements to run the tests by running ```tox -e py36,py37```
 tox==3.5.2
 twine==1.12.1
 pytest==3.8.2
diff --git a/tox.ini b/tox.ini
index b7696db66de1638a3d861cd654b9ed9f0a10acdf..1c6a3d45b2ba71dc04d0adb04a1a71b961f38dec 100644
--- a/tox.ini
+++ b/tox.ini
@@ -56,6 +56,9 @@ passenv =
     HTTP_PROXY
     HTTPS_PROXY
 whitelist_externals = sh
+deps =
+    -r{toxinidir}/requirements_dev.txt
+    -r{toxinidir}/requirements_continuous_integration.txt
 commands =
     sh -c 'ls benchmarks/*.py  | xargs -n 1 python'
 
@@ -71,9 +74,6 @@ passenv =
     HTTPS_PROXY
 deps =
     -r{toxinidir}/requirements_dev.txt
-; If you want to make tox run the tests with the same versions, create a
-; requirements.txt with the pinned versions and uncomment the following line:
-;     -r{toxinidir}/requirements.txt
 commands =
     sh -c 'echo DISPLAY: $DISPLAY'
     py.test --basetemp={envtmpdir}