Document constants

src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c

@@ -1214,10 +1214,12 @@ static const ge_precomp Bi[8] = {
 #include "base2.h"
 };
 
+/* 37095705934669439343138083508754565189542113879843219016388785533085940283555 */
 static const fe d = {
     -10913610,13857413,-15372611,6949391,114729,-8787816,-6275908,-3247719,-18696448,-12055116
 };
 
+/* sqrt(-1) */
 static const fe sqrtm1 = {
     -32595792,-7943725,9377950,3500415,12389472,-272473,-25146209,-2005654,326686,11406482
 };
@@ -1364,6 +1366,7 @@ void ge_p3_0(ge_p3 *h)
 r = p
 */
 
+/* 2 * d = 16295367250680780974490674513165176452449235426866156013048779062215315747161 */
 static const fe d2 = {
     -21827239,-5839606,-30745221,13898782,229458,15978800,-12551817,-6495438,29715968,9444199
 };