diff --git a/packages/overlays/matrix-synapse/patches/0006-Explain-why-we-flush_buffer-for-Python-print-.-outpu.patch b/packages/overlays/matrix-synapse/patches/0006-Explain-why-we-flush_buffer-for-Python-print-.-outpu.patch
new file mode 100644
index 0000000..39fc2fe
--- /dev/null
+++ b/packages/overlays/matrix-synapse/patches/0006-Explain-why-we-flush_buffer-for-Python-print-.-outpu.patch
@@ -0,0 +1,75 @@
+From a3bbd7eeabee7c6b229e95e0e04af5b430ea32db Mon Sep 17 00:00:00 2001
+From: Eric Eastwood <erice@element.io>
+Date: Tue, 13 May 2025 10:40:49 -0500
+Subject: [PATCH 06/34] Explain why we `flush_buffer()` for Python `print(...)`
+ output (#18420)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Spawning from using this code elsewhere and not knowing why it's there.
+
+Based on this article and @reivilibre's experience mentioning
+`PYTHONUNBUFFERED=1`,
+
+> #### programming languages where the default “print” statement buffers
+>
+> Also, here are a few programming language where the default print
+statement will buffer output when writing to a pipe, and some ways to
+disable buffering if you want:
+>
+> - Python (disable with `python -u`, or `PYTHONUNBUFFERED=1`, or
+`sys.stdout.reconfigure(line_buffering=False)`, or `print(x,
+flush=True)`)
+>
+> _--
+https://jvns.ca/blog/2024/11/29/why-pipes-get-stuck-buffering/#programming-languages-where-the-default-print-statement-buffers_
+---
+ changelog.d/18420.misc | 1 +
+ docker/configure_workers_and_start.py | 5 +++++
+ docker/start.py | 5 +++++
+ 3 files changed, 11 insertions(+)
+ create mode 100644 changelog.d/18420.misc
+
+diff --git a/changelog.d/18420.misc b/changelog.d/18420.misc
+new file mode 100644
+index 0000000000..d52175af91
+--- /dev/null
++++ b/changelog.d/18420.misc
+@@ -0,0 +1 @@
++Explain why we `flush_buffer()` for Python `print(...)` output.
+diff --git a/docker/configure_workers_and_start.py b/docker/configure_workers_and_start.py
+index df34d51f77..102a88fad1 100755
+--- a/docker/configure_workers_and_start.py
++++ b/docker/configure_workers_and_start.py
+@@ -352,6 +352,11 @@ def error(txt: str) -> NoReturn:
+
+
+ def flush_buffers() -> None:
++ """
++ Python's `print()` buffers output by default, typically waiting until ~8KB
++ accumulates. This method can be used to flush the buffers so we can see the output
++ of any print statements so far.
++ """
+ sys.stdout.flush()
+ sys.stderr.flush()
+
+diff --git a/docker/start.py b/docker/start.py
+index 818a5355ca..0be9976a0c 100755
+--- a/docker/start.py
++++ b/docker/start.py
+@@ -22,6 +22,11 @@ def error(txt: str) -> NoReturn:
+
+
+ def flush_buffers() -> None:
++ """
++ Python's `print()` buffers output by default, typically waiting until ~8KB
++ accumulates. This method can be used to flush the buffers so we can see the output
++ of any print statements so far.
++ """
+ sys.stdout.flush()
+ sys.stderr.flush()
+
+--
+2.49.0
+
|
