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diff --git a/src/ipa/libipa/algorithms/af_algorithm.cpp b/src/ipa/libipa/algorithms/af_algorithm.cpp
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+++ b/src/ipa/libipa/algorithms/af_algorithm.cpp
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2022, Raspberry Pi (Trading) Limited
+ * Copyright (C) 2022, Theobroma Systems
+ *
+ * af_algorithm.cpp - Autofocus control algorithm interface
+ */
+
+#include "af_algorithm.h"
+
+/**
+ * \file af_algorithm.h
+ * \brief AF algorithm common interface
+ */
+
+namespace libcamera::ipa::common::algorithms {
+
+/**
+ * \class AfAlgorithm
+ * \brief Common interface for auto-focus algorithms
+ * \tparam Module The IPA module type for this class of algorithms
+ *
+ * The AfAlgorithm class defines a standard interface for IPA auto focus
+ * algorithms.
+ */
+
+/**
+ * \fn AfAlgorithm::setMode()
+ * \brief Set auto focus mode
+ * \param[in] mode AF mode
+ */
+
+/**
+ * \fn AfAlgorithm::setRange()
+ * \brief set the range of focus distances that is scanned
+ * \param[in] range AF range
+ */
+
+/**
+ * \fn AfAlgorithm::setSpeed()
+ * \brief Set how fast algorithm should move the lens
+ * \param[in] speed Lens move speed
+ */
+
+/**
+ * \fn AfAlgorithm::setMetering()
+ * \brief Set AF metering mode
+ * \param[in] metering AF metering mode
+ */
+
+/**
+ * \fn AfAlgorithm::setWindows()
+ * \brief Set AF windows
+ * \param[in] windows AF windows
+ *
+ * Sets the focus windows used by the AF algorithm when AfMetering is set
+ * to AfMeteringWindows.
+ */
+
+/**
+ * \fn AfAlgorithm::setTrigger()
+ * \brief Starts or cancels the autofocus scan
+ * \param[in] trigger Trigger mode
+ */
+
+/**
+ * \fn AfAlgorithm::setPause()
+ * \brief Pause the autofocus while in AfModeContinuous mode.
+ * \param[in] pause Pause mode
+ */
+
+/**
+ * \fn AfAlgorithm::setLensPosition()
+ * \brief Set the lens position while in AfModeManual
+ * \param[in] lensPosition Lens position
+ */
+
+} /* namespace libcamera::ipa::common::algorithms */