diff --git a/ChangeLog.d/pk-large-stack-buffers.txt b/ChangeLog.d/pk-large-stack-buffers.txt
new file mode 100644
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+++ b/ChangeLog.d/pk-large-stack-buffers.txt
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+Bugfix
+   * Some functions in PK were using large buffers (around 2KB in the default
+     configuration) on the stack, which was a problem in environments with a
+     small stack. Those buffers are now allocated on the heap, except in
+     configurations where ECC is the only supported key type in PK, making PK
+     still independent of the heap in such configurations (if the ECC driver
+     itself is not using the heap). Fixes #476.