diff --git a/markdown/org/docs/patterns/bob/options/neckratio/en.md b/markdown/org/docs/patterns/bob/options/neckratio/en.md
index 281da515421..07db91bda7c 100644
--- a/markdown/org/docs/patterns/bob/options/neckratio/en.md
+++ b/markdown/org/docs/patterns/bob/options/neckratio/en.md
@@ -2,7 +2,10 @@
 title: Neck ratio
 ---
 
-<Fixme>Document this option</Fixme>
+Controls the size of the neck opening relative to the bib size. The bib size is determined by [head size](/docs/patterns/bob/options/headsize), this option controls how much to reduce the head size by to determine the circumference and width of the neck opening.
+
+- Increase the percentage to widen the neck opening.
+- Decrease the percentage to constrict the neck opening.
 
 
 ## Effect of this option on the pattern