diff --git a/README.md b/README.md
index 6b7fec4..587e8b3 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,8 @@ Plain numeric arrays are handled best via the methods in A, while associative ar
 
 - **of** - concatenates every argument into an array as is
 
+  _See also: A::concat()_
+
   ```php
   $items = A::of(1, 2, [3]); // [1, 2, [3]]
   ```
@@ -87,7 +89,17 @@ Plain numeric arrays are handled best via the methods in A, while associative ar
 - **length** -
 - **isEmpty** -
 - **isNotEmpty** -
-- **ensureArray** - wraps parameter into an array if it's anything else, than a numeric array
+
+- **ensureArray** - wraps parameter into an array if it's not a numeric array
+
+  ```php
+  A::ensureArray(123); // [123]
+  ```
+
+  ```php
+  A::ensureArray([4, 5, 6]); // [4, 5, 6]
+  ```
+
 - **append** -
 - **prepend** -
 - **pluck** -
@@ -272,11 +284,14 @@ Plain numeric arrays are handled best via the methods in A, while associative ar
 
 - **includes** -
 - **contains** -
-
 - **slice** -
 - **join** -
+
 - **pickRandom** - selects a random item from the given array
-- **concat** - concatenates every argument into an array. if any of the arguments are arrays, then those will get unnested
+
+- **concat** - concatenates every argument into an array. if any of the arguments are numeric arrays, then those will get unnested
+
+  _See also: A::of()_
 
   ```php
   A::concat([1, 2], 3, [4, 5]); // [1, 2, 3, 4, 5]
diff --git a/src/A.php b/src/A.php
index bdff5fa..e34809a 100644
--- a/src/A.php
+++ b/src/A.php
@@ -106,15 +106,15 @@ public static function ensureArray($data): array
     }
 
     // A::append([4, 5, 6], [1, 2]) -> [1, 2, 4, 5, 6]
-    public static function append(array $arr, array $data): array
+    public static function append($value, array $data): array
     {
-        return array_merge($data, self::ensureArray($arr));
+        return self::concat($data, $value);
     }
 
     // A::prepend([4, 5, 6], [1, 2]) -> [4, 5, 6, 1, 2]
-    public static function prepend(array $arr, array $data): array
+    public static function prepend($value, array $data): array
     {
-        return array_merge(self::ensureArray($arr), $data);
+        return self::concat($value, $data);
     }
 
     // A::pluck('color', [['color' => 'red', ...], ['color' => 'green', ...]]) -> ['red', 'green']