add news note
diff --git a/Misc/NEWS b/Misc/NEWS
index ce5a1d2..7c82dbe 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
 Core and Builtins
 -----------------
 
+- Issue #12225: Still allow Python to build if Python is not in its hg repo or
+  mercurial is not installed.
+
 - Issue #1195: my_fgets() now always clears errors before calling fgets(). Fix
   the following case: sys.stdin.read() stopped with CTRL+d (end of file),
   raw_input() interrupted by CTRL+c.