diff --git a/doc/release-notes.md b/doc/release-notes.md
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -10,6 +10,7 @@
  - The `inactivehdmaster` property in the `dumpwallet` output has been
    deprecated in favor of `inactivehdseed`. `inactivehdmaster` will be removed
    in V0.21.
+ - Building from source now requires python 3.5 or greater
 
 'label' and 'account' APIs for wallet
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