diff --git a/convert.go b/convert.go
index 3f95b99..41dacf7 100644
--- a/convert.go
+++ b/convert.go
@@ -70,22 +70,23 @@ func P2gc(p string) (gc string, err error) {
 
 /*
 Gc2p - Galactic coordinates to portal code
-Requires 1 string and returns a string and error
+Requires 1 string and 1 int returns a string and error
 	var gc string
 		Galactic address (ex. 042F:0079:0D55:006A)
+	var p int
+		Planet ID [1-6]
 	Return var string
 		Portal Glyph hex string 12 chars in len (ex. 006afa556c30)
 */
-func Gc2p(gc string) (portalcode string, err error) {
-	if err != nil {
-		panic(err)
-	}
-
-	/*TODO: add option for Planet choice (1-6)*/
+func Gc2p(gc string, p int) (portalcode string, err error) {
 	// split and store string
 	// coords[0] == X; coords[1] == Y coords[2] == Z;
 	// coords[3] == SSI coords[4] == P
-	coords := strings.Split(gc+":1", ":")
+	if p > 6 {
+		p = 1
+	}
+	nustring := fmt.Sprintf("%s:%d", gc, p)
+	coords := strings.Split(nustring, ":")
 	for n := 0; n < len(coords); n++ {
 		portalcode = portalcode + coords[n]
 	}