diff --git a/docs/requirements.rst b/docs/requirements.rst
index 36bc234c0..5d4fddaf0 100644
--- a/docs/requirements.rst
+++ b/docs/requirements.rst
@@ -52,6 +52,7 @@ well as ImageMagick:
 
     $ brew install ghostscript
     $ brew install imagemagick
+    $ brew install libmagic
 
 
 .. _requirements-baremetal: