From 1e6f0a5c4d21f6d9fa68bd799c794a92a8f3f649 Mon Sep 17 00:00:00 2001
From: Chris Palmer <nop.head@gmail.com>
Date: Sat, 12 Dec 2020 10:58:54 +0000
Subject: [PATCH] Added link to block article about screw_polysink().

---
 readme.md           | 2 ++
 vitamins/screw.scad | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/readme.md b/readme.md
index 00a59ba..c85d0bc 100644
--- a/readme.md
+++ b/readme.md
@@ -2904,6 +2904,8 @@ These items are sysmtrical, so by default the origin is in the centre but it can
 ## Screws
 Machine screws and wood screws with various head styles.
 
+For an explanation of ```screw_polysink()``` see <https://hydraraptor.blogspot.com/2020/12/sinkholes.html>.
+
 
 [vitamins/screws.scad](vitamins/screws.scad) Object definitions.
 
diff --git a/vitamins/screw.scad b/vitamins/screw.scad
index 3cbb3ed..b833b59 100644
--- a/vitamins/screw.scad
+++ b/vitamins/screw.scad
@@ -19,6 +19,8 @@
 
 //
 //! Machine screws and wood screws with various head styles.
+//!
+//! For an explanation of ```screw_polysink()``` see <https://hydraraptor.blogspot.com/2020/12/sinkholes.html>.
 //
 include <../utils/core/core.scad>