sqrt.c: add forgotten comments.

1 files changed, 5 insertions, 1 deletions

diff --git a/sqrt.c b/sqrt.c
index 5a78693..281e73e 100644
--- a/sqrt.c
+++ b/sqrt.c
@@ -32,7 +32,11 @@ double
 		return 0;
 
 	x0 = -1;
-	x = n > 1? n/2: 1;
+	x = n > 1? n/2: 1;	/* initial estimate */
+	/*
+	 * take advantage of the computer's discreteness
+	 * to get the most accurate result.
+	 */
 	while(x0 != x){
 		x0 = x;
 		x = 0.5*(x0 + n/x0);