Stating the goal of the exercise

exercism · Jan 1, 2017 · 60c733c · 60c733c
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diff --git a/exercises/luhn/description.md b/exercises/luhn/description.md
@@ -3,6 +3,8 @@ a simple checksum formula used to validate a variety of identification
 numbers, such as credit card numbers and Canadian Social Insurance
 Numbers.
 
+The task is to write a function that checks if a given string is valid.
+
 Validating a Number
 ------