diff --git a/Pipfile b/Pipfile
index 87cebf0b..451eb5e2 100644
--- a/Pipfile
+++ b/Pipfile
@@ -1,5 +1,6 @@
-# Note that there is a dev-requirements.txt file in this project, if you are 
-# updating this Pipfile make sure to update the dev-requirements.txt accordingly
+# Note that there are a dev-requirements.txt and a docs/doc-requirements.txt
+# files in this project, if you are updating this Pipfile make sure to 
+# update these accordingly
 
 [dev-packages]
 pytest="*"
diff --git a/dev-requirements.txt b/dev-requirements.txt
index 28caf71e..722e7c01 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,5 +1,6 @@
 # Note that there is also a Pipfile for this project if you are updating this 
 # file do not forget to update thr Pipfile accordingly
+pyyaml
 pytest
 wheel
 pytest-cov
diff --git a/docs/doc-requirements.txt b/docs/doc-requirements.txt
index dea73e15..7110a020 100644
--- a/docs/doc-requirements.txt
+++ b/docs/doc-requirements.txt
@@ -1,3 +1,5 @@
+# Note that there is also a Pipfile for this project if you are updating this 
+# file do not forget to update thr Pipfile accordingly
 sphinx>=1.4, !=1.5.4
 recommonmark
 alabaster