diff --git a/include/libcamera/buffer.h b/include/libcamera/buffer.h
index c349b995..80602124 100644
--- a/include/libcamera/buffer.h
+++ b/include/libcamera/buffer.h
@@ -40,6 +40,7 @@ private:
 class BufferMemory final
 {
 public:
+	const std::vector<Plane> &planes() const { return planes_; }
 	std::vector<Plane> &planes() { return planes_; }
 
 private:
diff --git a/src/libcamera/buffer.cpp b/src/libcamera/buffer.cpp
index 4407201b..960eeb8f 100644
--- a/src/libcamera/buffer.cpp
+++ b/src/libcamera/buffer.cpp
@@ -181,6 +181,12 @@ void *Plane::mem()
  * image format is multi-planar.
  */
 
+/**
+ * \fn BufferMemory::planes() const
+ * \brief Retrieve the planes within the buffer
+ * \return A const reference to a vector holding all Planes within the buffer
+ */
+
 /**
  * \fn BufferMemory::planes()
  * \brief Retrieve the planes within the buffer