diff --git a/spa/plugins/audioconvert/fmt-ops-sse2.c b/spa/plugins/audioconvert/fmt-ops-sse2.c
index 6dae601cf..ee5c89c06 100644
--- a/spa/plugins/audioconvert/fmt-ops-sse2.c
+++ b/spa/plugins/audioconvert/fmt-ops-sse2.c
@@ -284,6 +284,7 @@ conv_s24_to_f32d_1s_sse2(void *data, void * SPA_RESTRICT dst[], const void * SPA
 	}
 }
 
+// Non static, referenced by `fmt-ops-sse41.c`.
 void
 conv_s24_to_f32d_2s_sse2(void *data, void * SPA_RESTRICT dst[], const void * SPA_RESTRICT src,
 		uint32_t n_channels, uint32_t n_samples)
diff --git a/spa/plugins/audioconvert/fmt-ops-ssse3.c b/spa/plugins/audioconvert/fmt-ops-ssse3.c
index 6c9087f95..046003df5 100644
--- a/spa/plugins/audioconvert/fmt-ops-ssse3.c
+++ b/spa/plugins/audioconvert/fmt-ops-ssse3.c
@@ -6,6 +6,7 @@
 
 #include <tmmintrin.h>
 
+// Non static, referenced by `fmt-ops-sse41.c`.
 void
 conv_s24_to_f32d_4s_ssse3(void *data, void * SPA_RESTRICT dst[], const void * SPA_RESTRICT src,
 		uint32_t n_channels, uint32_t n_samples)