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diff --git a/README.md b/README.md
index 889cc4e..0d448f1 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,9 @@ Standard markdown
 Standard markdown is a [specification of markdown syntax][the spec],
 together with BSD3-licensed implementations (`stmd`) in C and javascript.
 
+The spec and all of the code can be found in
+[this repository](http://github.com/jgm/stmd).
+
 The implementations
 -------------------