diff --git a/include/libcamera/ipa/ipa_interface.h b/include/libcamera/ipa/ipa_interface.h
index 47f81d1d..5d99e2cf 100644
--- a/include/libcamera/ipa/ipa_interface.h
+++ b/include/libcamera/ipa/ipa_interface.h
@@ -20,6 +20,11 @@
 
 namespace libcamera {
 
+/*
+ * Structs that are defined in core.mojom and have the skipHeader tag must be
+ * forward-declared or #included here.
+ */
+
 struct CameraSensorInfo;
 
 class IPAInterface