Add "nil" to types list.

Signed-off-by: Pete Higgins <pete@peterhiggins.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/tasks/docs.rb b/tasks/docs.rb
index b823b2f90f..4360dd0b9f 100755
--- a/tasks/docs.rb
+++ b/tasks/docs.rb
@@ -96,7 +96,7 @@ namespace :docs_site do
           "true"
         when "FalseClass"
           "false"
-        when "NilClass"
+        when "NilClass", nil
           "nil"
         else
           x