diff --git a/README.adoc b/README.adoc
index 6df73f2..305445e 100644
--- a/README.adoc
+++ b/README.adoc
@@ -10,7 +10,7 @@ HTTP `GET` is used to request an identicon image.
 curl http://localhost:8000/avatar/23463b99b62a72f26ed677cc556c44e8?s=100&c=v2
 ....
 
-Instead of requesting identicons for MD5 hashes of usernames or mail addresses, it is possible to use plain username and mail address. The will result in the same generated identicon.
+Instead of requesting identicons for MD5 hashes of usernames or mail addresses, it is possible to use plain username and mail address. This will result in the same generated identicon.
 
 Use request query parameter `s` to request images with specified size. Default value is 80px. The size is limited to a maximum value of 512px.
 
diff --git a/idicon.go b/idicon.go
index 560a5eb..5ded080 100644
--- a/idicon.go
+++ b/idicon.go
@@ -40,7 +40,6 @@ func genGhIcon(id string, size int, f func([16]byte) color.RGBA) *image.NRGBA {
 	if size > 512 {
 		size = 512
 	}
-
 	blocks := 5
 
 	hash := hashBytes(id)
@@ -52,7 +51,7 @@ func genGhIcon(id string, size int, f func([16]byte) color.RGBA) *image.NRGBA {
 			ni := x + blocks*(blocks-y-1)
 			if x+blocks*y > 2*blocks {
 				di := (x + blocks*y) - 2*blocks
-				data[di] = nibbles[ni]%2 == 0
+				data[di] = nibbles[ni%32]%2 == 0
 			}
 		}
 	}