diff --git a/src/ipa/ipu3/algorithms/awb.cpp b/src/ipa/ipu3/algorithms/awb.cpp
index 59bc6900..af1edd11 100644
--- a/src/ipa/ipu3/algorithms/awb.cpp
+++ b/src/ipa/ipu3/algorithms/awb.cpp
@@ -86,6 +86,9 @@ static constexpr uint32_t kMinGreenLevelInZone = 32;
  *
  * \var Accumulator::blue
  * \brief Sum of the average blue values of each unsaturated cell in the zone
+ *
+ * \var Accumulator::sum
+ * \brief A structure containing the average red, green and blue sums
  */
 
 /**