diff --git a/staging/color-management/appendix.md b/staging/color-management/appendix.md
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+---
+SPDX-FileCopyrightText: 2025 Collabora, Ltd.
+SPDX-License-Identifier: MIT
+---
+
+Contents
+
+[TOC]
+
+# Wayland Color-Management Protocol
+
+This document is an appendix to the [color-management][cm-spec]
+protocol specification.
+
+## Transfer functions (normative)
+
+`wp_color_manager_v1` enumeration `transfer_function` lists a selection
+of transfer functions describing display-referred image encoding between
+normalized [electrical] $`E`$ and [optical] $`L`$ values. The function
+definitions are as follows.
+
+$`L`$
+: Screen luminance in cd/m² in the assumed viewing environment.
+Since the protocol uses the reference luminance level as a proxy for the
+environment, these values must be interpreted in the context of the
+reference luminance level.
+
+$`L_W`$
+: Screen luminance for peak white; the primary color volume maximum luminance.
+
+$`L_B`$
+: Screen luminance for black; the primary color volume minimum luminance.
+
+
+### `bt1886`
+
+```math
+L = a\left(\max\left(E + b,0\right)\right)^\gamma
+```
+
+where $`\gamma = 2.4`$ and the parameters
+
+```math
+a = \left(L_W^{1/\gamma} - L_B^{1/\gamma}\right)^\gamma,
+```
+
+```math
+b = \frac{L_B^{1/\gamma}}{L_W^{1/\gamma} - L_B^{1/\gamma}}.
+```
+
+The above are specified by [ITU-R BT.1886].
+
+Note, that $`E < 0`$ and $`E > 1`$ are possible with limited range
+quantization, as required by e.g. the calibration method in [ITU-R BT.814].
+
+
+### `gamma22`
+
+```math
+O = E^{2.2}, \quad 0 \leq E \leq 1
+```
+
+```math
+L = (L_W - L_B)O + L_B
+```
+
+### `gamma28`
+
+```math
+O = E^{2.8}, \quad 0 \leq E \leq 1
+```
+
+```math
+L = (L_W - L_B)O + L_B
+```
+
+### `ext_linear`
+
+```math
+O = E, \quad \forall E \in \Reals
+```
+
+```math
+L = (L_W - L_B)O + L_B
+```
+
+### `st2084_pq`
+
+```math
+\begin{align*}
+m_1 &=& \vphantom{\Bigg(} \frac{2610}{16384} &= 0.1593017578125\\
+m_2 &=& \vphantom{\Bigg(} 128\left(\frac{2523}{4096}\right) &= 78.84375\\
+c_1 = c_3 − c_2 + 1 &=& \vphantom{\Bigg(} \frac{3424}{4096} &= 0.8359375\\
+c_2 &=& \vphantom{\Bigg(} 32\left(\frac{2413}{4096}\right) &= 18.8515625\\
+c_3 &=& \vphantom{\Bigg(} 32\left(\frac{2392}{4096}\right) &= 18.6875
+\end{align*}
+```
+
+```math
+O = \left(
+  \frac{\max\left[
+    \left(E^\frac{1}{m_2} - c_1\right), 0
+  \right]}{c_2 - c_3 E^\frac{1}{m_2}}
+\right)^\frac{1}{m_1},
+\quad 0 \leq E \leq 1
+```
+
+And the inverse
+
+```math
+E = \left( \frac{c_1 + c_2 O^{m_1}}{1 + c_3 O^{m_1}} \right)^{m_2},
+\quad 0 \leq O \leq 1
+```
+
+The above are specified by [ITU-R BT.2100].
+
+```math
+L = 10'000\ \mathrm{cd/m²} \cdot O + L_B
+```
+
+
+[cm-spec]: https://gitlab.freedesktop.org/wayland/wayland-protocols/-/tree/main/staging/color-management
+[electrical]: https://gitlab.freedesktop.org/pq/color-and-hdr/-/blob/main/doc/glossary.md#electrical-color-value
+[optical]: https://gitlab.freedesktop.org/pq/color-and-hdr/-/blob/main/doc/glossary.md#optical-color-value
+[ITU-R BT.814]: https://gitlab.freedesktop.org/pq/color-and-hdr/-/blob/main/doc/specs.md#itu-r-bt814
+[ITU-R BT.1886]: https://gitlab.freedesktop.org/pq/color-and-hdr/-/blob/main/doc/specs.md#itu-r-bt1886
+[ITU-R BT.2100]: https://gitlab.freedesktop.org/pq/color-and-hdr/-/blob/main/doc/specs.md#itu-r-bt2100
diff --git a/staging/color-management/color-management-v1.xml b/staging/color-management/color-management-v1.xml
index 2958a19..96a063e 100644
--- a/staging/color-management/color-management-v1.xml
+++ b/staging/color-management/color-management-v1.xml
@@ -57,6 +57,9 @@
     color-management extension when necessary, particularly with the YUV family
     of pixel formats.
 
+    The normative appendix for this protocol is in the appendix.md file beside
+    this XML file.
+
     The color-and-hdr repository
     (https://gitlab.freedesktop.org/pq/color-and-hdr) contains
     background information on the protocol design and legacy color management.
@@ -251,6 +254,8 @@
         characteristics of displays.
 
         A value of 0 is invalid and will never be present in the list of enums.
+
+        See appendix.md for the formulae.
       </description>
 
       <entry name="bt1886" value="1">