diff --git a/package/libsigrok/libsigrok.mk b/package/libsigrok/libsigrok.mk
index 4c1f31ea6e..8e7c355fd0 100644
--- a/package/libsigrok/libsigrok.mk
+++ b/package/libsigrok/libsigrok.mk
@@ -53,6 +53,7 @@ endif
 
 ifeq ($(BR2_PACKAGE_LIBSIGROKCXX),y)
 LIBSIGROK_CONF_OPTS += --enable-cxx
+# host-doxygen is used by C++ bindings to parse libsigrok symbols
 LIBSIGROK_DEPENDENCIES += \
 	glibmm \
 	host-doxygen \