diff --git a/doc/doxygen.cfg b/doc/doxygen.cfg
index cdcc9188..dc55cbea 100644
--- a/doc/doxygen.cfg
+++ b/doc/doxygen.cfg
@@ -27,6 +27,7 @@ INPUT            = index.doxygen \
 		   ../include/pcm_extplug.h \
 		   ../include/pcm_ioplug.h \
 		   ../include/control_external.h \
+		   ../include/mixer.h \
 		   ../include/conv.h \
 		   ../include/instr.h \
 		   ../src/error.c \