diff --git a/qemu/fpu/softfloat-specialize.h b/qemu/fpu/softfloat-specialize.h
index b4bc35ab..5e58d195 100644
--- a/qemu/fpu/softfloat-specialize.h
+++ b/qemu/fpu/softfloat-specialize.h
@@ -448,7 +448,8 @@ static float32 commonNaNToFloat32(commonNaNT a, float_status *status)
 static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
                    flag aIsLargerSignificand)
 {
-    /* ARM mandated NaN propagation rules: take the first of:
+    /* ARM mandated NaN propagation rules (see FPProcessNaNs()), take
+     * the first of:
      *  1. A if it is signaling
      *  2. B if it is signaling
      *  3. A (quiet)