diff --git a/TargetSpecific.md b/TargetSpecific.md
index 3ecea1a7..ef703bfa 100644
--- a/TargetSpecific.md
+++ b/TargetSpecific.md
@@ -88,4 +88,6 @@ func TestSumCompare(t *testing.T) {
 }
 ```
 
-For more complete examples see the [x/crypto/poly1305](https://github.com/golang/crypto/tree/master/poly1305) and [x/crypto/salsa20/salsa](https://github.com/golang/crypto/tree/master/salsa20/salsa) packages.
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+For more complete examples see the [x/crypto/poly1305](https://github.com/golang/crypto/tree/master/poly1305) and [x/crypto/salsa20/salsa](https://github.com/golang/crypto/tree/master/salsa20/salsa) packages.
+
+Note that packages in the standard library (as opposed to modules like golang.org/x/crypto) do not use the `gccgo` and `purego` build tags.
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