diff --git a/mr/search.go b/mr/search.go
index af8d82a..ca71795 100644
--- a/mr/search.go
+++ b/mr/search.go
@@ -4,6 +4,7 @@ func zero[T any]() (v T) {
 	return
 }
 
+// Find returns the first element in the slice that satisfies the provided testing function. Otherwise zero value is returned.
 func Find[T any](arr []T, predict func(T) bool) T {
 	for _, v := range arr {
 		if predict(v) {
@@ -13,6 +14,7 @@ func Find[T any](arr []T, predict func(T) bool) T {
 	return zero[T]()
 }
 
+// FindP returns the first element in the slice that satisfies the provided testing function. Otherwise nil is returned.
 func FindP[T any](arr []T, predict func(*T) bool) *T {
 	for _, v := range arr {
 		if predict(&v) {
@@ -21,3 +23,13 @@ func FindP[T any](arr []T, predict func(*T) bool) *T {
 	}
 	return nil
 }
+
+// FindIndex returns the index of the first element in the slice that satisfies the provided testing function. Otherwise -1 is returned.
+func FindIndex[T any](arr []T, predict func(T) bool) int {
+	for i, v := range arr {
+		if predict(v) {
+			return i
+		}
+	}
+	return -1
+}