doc: clarify N-API version Matrix

I was asked by a community member if they needed to recompile for v12.x based on the version matrix. Add additional context to help ensure it is clear that this is not the case. PR-URL: #27942 Reviewed-By: Richard Lau <[email protected]> Reviewed-By: Beth Griggs <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Christopher Hiller <[email protected]> Reviewed-By: James M Snell <[email protected]>
nodejs · Jun 11, 2019 · fddc2d7 · fddc2d7
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diff --git a/doc/api/n-api.md b/doc/api/n-api.md
@@ -145,6 +145,12 @@ available to the module code.
 
 ## N-API Version Matrix
 
+N-API versions are additive and versioned independantly from Node.js.
+Version 4 is an extension to version 3 in that it has all of the APIs
+from version 3 with some additions. This means that you
+do not need to recompile for new versions of Node.js which are
+listed as supporting a later version.
+
 |       | 1       | 2        | 3        | 4        |
 |:-----:|:-------:|:--------:|:--------:|:--------:|
 | v6.x  |         |          | v6.14.2* |          |