diff --git a/util/include/rusefi/scaled_channel.h b/util/include/rusefi/scaled_channel.h
index d9c6a0e..9917769 100644
--- a/util/include/rusefi/scaled_channel.h
+++ b/util/include/rusefi/scaled_channel.h
@@ -1,3 +1,7 @@
+/**
+ * @file scaled_channel.h
+ */
+
 #pragma once
 
 #include <cmath>
diff --git a/util/util.mk b/util/util.mk
index 9a53b64..f866a71 100644
--- a/util/util.mk
+++ b/util/util.mk
@@ -11,5 +11,6 @@ RUSEFI_LIB_CPP_TEST += \
 	$(RUSEFI_LIB)/util/test/test_crc.cpp \
 	$(RUSEFI_LIB)/util/test/test_fragments.cpp \
 	$(RUSEFI_LIB)/util/test/test_interpolation.cpp \
+	$(RUSEFI_LIB)/util/test/test_scaled.cpp \
 	$(RUSEFI_LIB)/util/test/test_math.cpp \