diff --git a/requirements.txt b/requirements.txt
index cc64d97d..f6f82ce6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,4 +7,6 @@ picamera==1.13
 pyyaml==3.13
 numpy==1.10.1
 Pillow
-RPi.GPIO
\ No newline at end of file
+RPi.GPIO
+
+sphinxcontrib-httpdomain
\ No newline at end of file