Mention the pseudo-code fragment from which this is based and correct
the spelling of signalling.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 fpu/softfloat2a/softfloat-specialize.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fpu/softfloat2a/softfloat-specialize.h b/fpu/softfloat2a/softfloat-specialize.h
index c8282b8bf7..2ccd4abe11 100644
--- a/fpu/softfloat2a/softfloat-specialize.h
+++ b/fpu/softfloat2a/softfloat-specialize.h
@@ -445,14 +445,14 @@ static float32 commonNaNToFloat32(commonNaNT a, float_status *status)
 
 #if defined(TARGET_ARM)
 static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
-                    flag aIsLargerSignificand)
+                   flag aIsLargerSignificand)
 {
-    /* ARM mandated NaN propagation rules: take the first of:
-     *  1. A if it is signaling
-     *  2. B if it is signaling
+    /* ARM mandated NaN propagation rules (see FPProcessNaNs()), take the first of:
+     *  1. A if it is signalling
+     *  2. B if it is signalling
      *  3. A (quiet)
      *  4. B (quiet)
-     * A signaling NaN is always quietened before returning it.
+     * A signalling NaN is always quietened before returning it.
      */
     if (aIsSNaN) {
         return 0;
-- 
2.13.0