3_b_2: Add solution

2 files changed, 7 insertions, 3 deletions

diff --git a/README.md b/README.md
index 113edbb..2b028e4 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ more visible in the list the first exercise of a group is in bold italics.
 | **_3_a_1_**    | yes    | 60   | 3. Defining types, streamlining functions |
 | 3_a_2          | yes    |      | |
 | **_3_b_1_**    | yes    | 69   | |
-| 3_b_2          |        |      | |
+| 3_b_2          | yes, in 3_b_1 |      | |
 | 3_b_3          |        |      | |
 | 3_b_4          |        |      | |
 | 3_b_5          |        |      | |
diff --git a/ch03/3_b_1.hs b/ch03/3_b_1.hs
index 4db9c0c..564b6be 100644
--- a/ch03/3_b_1.hs
+++ b/ch03/3_b_1.hs
@@ -1,6 +1,10 @@
--- Write a function that computes the number of elements in a list. To test it,
--- ensure that it gives the same answers as the standard length function.
+-- 1. Write a function that computes the number of elements in a list. To test
+--    it, ensure that it gives the same answers as the standard length function.
+--
+-- 2. Add a type signature for your function to your source file. To test it,
+--    load the source file into ghci again.
 
+myLength :: [a] -> Int
 myLength (x:xs) = 1 + myLength xs
 myLength []     = 0