diff --git a/docs/install-anaconda.md b/docs/install-anaconda.md
index ad6213fc169a5d3c30e9459669f21d89d5bb20ae..db7b2bd7d12655f48e5eb4ccb9f1fe2b5371e4b5 100644
--- a/docs/install-anaconda.md
+++ b/docs/install-anaconda.md
@@ -9,7 +9,7 @@ conda update --all
 conda create -n wetb_py3 python=3.5
 source activate wetb_py3
 conda install setuptools_scm future h5py pytables pytest nose sphinx
-conda install scipy pandas matplotlib cython xlrd coverage
+conda install scipy pandas matplotlib cython xlrd coverage xlwt
 pip install pyscaffold pytest-cov
 ```
 
diff --git a/requirements.txt b/requirements.txt
index 4f4ab5838748fa63eb598afca49c3f6cd8148ef6..7db2fa20e5157ff89396e03ed16541fcbd73a453 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@ scipy>=0.9
 matplotlib
 pytest
 xlrd
+xlwt
 h5py
 pandas
 tables