diff --git a/requirements.txt b/requirements.txt
index 385e048..dc5f7ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,25 +5,52 @@
 #    pip-compile --output-file requirements.txt setup.py requirements-dev.in
 #
 asynctest==0.10.0
-certifi==2017.7.27.1      # via requests
-chardet==3.0.4            # via requests
-click==6.7                # via pip-tools
-cookies==2.2.1            # via responses
-coverage==4.4.1           # via pytest-cov
-fancycompleter==0.7       # via pdbpp
-first==2.0.1              # via pip-tools
-idna==2.6                 # via requests
+    # via -r requirements-dev.in
+certifi==2017.7.27.1
+    # via requests
+chardet==3.0.4
+    # via requests
+click==6.7
+    # via pip-tools
+cookies==2.2.1
+    # via responses
+coverage==4.4.1
+    # via pytest-cov
+fancycompleter==0.7
+    # via pdbpp
+first==2.0.1
+    # via pip-tools
+idna==2.6
+    # via requests
 isort==4.2.15
+    # via -r requirements-dev.in
 pdbpp==0.9.1
+    # via -r requirements-dev.in
 pip-tools==1.9.0
+    # via -r requirements-dev.in
 pipdeptree==0.10.1
-py==1.4.34                # via pytest
-pygments==2.2.0           # via pdbpp
+    # via -r requirements-dev.in
+py==1.10.0
+    # via pytest
+pygments==2.2.0
+    # via pdbpp
 pytest-cov==2.5.1
+    # via -r requirements-dev.in
 pytest==3.2.1
+    # via
+    #   -r requirements-dev.in
+    #   pytest-cov
 requests==2.18.4
+    # via responses
 responses==0.7.0
-six==1.10.0               # via pip-tools, responses
+    # via -r requirements-dev.in
+six==1.10.0
+    # via
+    #   pip-tools
+    #   responses
 testfixtures==5.1.1
-urllib3==1.22             # via requests
-wmctrl==0.3               # via pdbpp
+    # via -r requirements-dev.in
+urllib3==1.22
+    # via requests
+wmctrl==0.3
+    # via pdbpp