Link to Building an AMP Extension document. (ampproject#5451)

ooyala · Nov 30, 2016 · ca2f193 · ca2f193
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diff --git a/DEVELOPING.md b/DEVELOPING.md
@@ -161,6 +161,7 @@ In particular, we try to maintain "it might not be perfect but isn't broken"-sup
 - [Design Principles](DESIGN_PRINCIPLES.md)
 - [Life of an AMP *](https://docs.google.com/document/d/1WdNj3qNFDmtI--c2PqyRYrPrxSg2a-93z5iX0SzoQS0/edit#)
 - [AMP Layout system](spec/amp-html-layout.md)
+- [Building an AMP Extension](https://docs.google.com/document/d/19o7eDta6oqPGF4RQ17LvZ9CHVQN53whN-mCIeIMM8Qk/edit#)
 
 We also recommend scanning the [spec](spec/). The non-element part should help understand some of the design aspects.