diff --git a/README.md b/README.md
index a9919919b..16a5dd1e1 100644
--- a/README.md
+++ b/README.md
@@ -74,10 +74,10 @@ var average = arr =>
 
 ### Capitalize first letter
 
-Use `toUpperCase()` to capitalize first letter, `slice(1)` to get the rest of the string.
+Use `sice(0,1)` and `toUpperCase()` to capitalize first letter, `slice(1)` to get the rest of the string.
 
 ```js
-var capitalize = str => str[0].toUpperCase() + str.slice(1);
+var capitalize = str => str.slice(0, 1).toUpperCase() + str.slice(1);
 ```
 
 ### Count occurrences of a value in array
diff --git a/snippets/capitalize-first-letter.md b/snippets/capitalize-first-letter.md
index 84447ee21..1310e76ed 100644
--- a/snippets/capitalize-first-letter.md
+++ b/snippets/capitalize-first-letter.md
@@ -1,6 +1,6 @@
 ### Capitalize first letter
 
-Use `toUpperCase()` to capitalize first letter, `slice(1)` to get the rest of the string.
+Use `sice(0,1)` and `toUpperCase()` to capitalize first letter, `slice(1)` to get the rest of the string.
 
 ```js
 var capitalize = str => str.slice(0, 1).toUpperCase() + str.slice(1);