factor: tweak comments

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/coreutils/factor.c b/coreutils/factor.c
index 66d6a7cae..7adc2385a 100644
--- a/coreutils/factor.c
+++ b/coreutils/factor.c
@@ -58,7 +58,7 @@ static NOINLINE void factorize(wide_t N)
         // unsigned count3;
         // unsigned count5;
         // unsigned count7;
-        // ^^^^^^^^^^^^^^^ commented-out simple siving code (easier to grasp).
+        // ^^^^^^^^^^^^^^^ commented-out simple sieving code (easier to grasp).
         // Faster sieving, using one word for potentially up to 6 counters:
         // count upwards in each mask, counter "triggers" when it sets its mask to "100[0]..."
         // 10987654321098765432109876543210 - bits 31-0 in 32-bit word
@@ -94,6 +94,8 @@ static NOINLINE void factorize(wide_t N)
          * 18446744073709551601 = 53 348051774975651917
          * the last factor requires testing up to
          * 589959129 - about 100 million iterations.
+         * The slowest case (largest prime) for N < 2^64 is
+         * factor 18446744073709551557 (0xffffffffffffffc5).
          */
         max_factor = isqrt_odd(N);
         // count3 = 3;