diff --git a/README.md b/README.md
index 6dff38d61..f5ccbea25 100644
--- a/README.md
+++ b/README.md
@@ -153,7 +153,7 @@ Use `reduce()` to get all elements that are not arrays, flatten each element tha
 
 ```js
 const deepFlatten = arr =>
-  arr.reduce((a, v) => a.concat(Array.isArray(v) ? deepFlatten(v) : v), []);
+  arr.reduce( (a, v) => a.concat( Array.isArray(v) ? deepFlatten(v) : v ), []);
 // deepFlatten([1,[2],[[3],4],5]) -> [1,2,3,4,5]
 ```
 
@@ -240,7 +240,7 @@ Use `reduce()` to get all elements inside the array and `concat()` to flatten th
 
 ```js
 const flatten = arr => arr.reduce( (a, v) => a.concat(v), []);
-// flatten([1,[2],3,4) -> [1,2,3,4]
+// flatten([1,[2],3,4]) -> [1,2,3,4]
 ```
 
 ### Get max value from array
diff --git a/snippets/deep-flatten-array.md b/snippets/deep-flatten-array.md
index 545c4c8d4..472143583 100644
--- a/snippets/deep-flatten-array.md
+++ b/snippets/deep-flatten-array.md
@@ -5,6 +5,6 @@ Use `reduce()` to get all elements that are not arrays, flatten each element tha
 
 ```js
 const deepFlatten = arr =>
-  arr.reduce( (a, v) => a.concat( Array.isArray(v) ? flatten(v) : v ), []);
+  arr.reduce( (a, v) => a.concat( Array.isArray(v) ? deepFlatten(v) : v ), []);
 // deepFlatten([1,[2],[[3],4],5]) -> [1,2,3,4,5]
 ```