diff --git a/02-hello-haskell/2.5-comprehension-check.md b/02-hello-haskell/2.5-comprehension-check.md
index 3f220b8..5613d88 100644
--- a/02-hello-haskell/2.5-comprehension-check.md
+++ b/02-hello-haskell/2.5-comprehension-check.md
@@ -1,4 +1,4 @@
-# Exercises: Comprhension check
+# Exercises: Comprehension check
 ## Exercise 1
 To declare these functions in the REPL, you need to prepend them with **let**.
 
diff --git a/02-hello-haskell/src/chapter.hs b/02-hello-haskell/src/chapter.hs
deleted file mode 100644
index f1108b2..0000000
--- a/02-hello-haskell/src/chapter.hs
+++ /dev/null
@@ -1,11 +0,0 @@
--- 4
-waxOn = x * 5
-  where z = 7
-        x = y ^ 2
-        y = z + 8
-
--- 5
-triple x = x * 3
-
--- 6
-waxOff x = triple x
\ No newline at end of file
diff --git a/02-hello-haskell/src/chapter2.hs b/02-hello-haskell/src/chapter2.hs
index 89fbb1f..b1b67f8 100644
--- a/02-hello-haskell/src/chapter2.hs
+++ b/02-hello-haskell/src/chapter2.hs
@@ -36,3 +36,16 @@ bar x = pi * (x * x)
 x = 7
 y = 18
 f = x + y
+
+-- 2.11 Chpater Exercises
+-- 4
+waxOn = x * 5
+  where z = 7
+        x = y ^ 2
+        y = z + 8
+
+-- 5
+triple x = x * 3
+
+-- 6
+waxOff x = triple x
diff --git a/03-strings/3.11-chapter-exercises.md b/03-strings/3.11-chapter-exercises.md
index aac3334..3c8b197 100644
--- a/03-strings/3.11-chapter-exercises.md
+++ b/03-strings/3.11-chapter-exercises.md
@@ -2,7 +2,7 @@
 ## Reading syntax
 ### Excercise 1
 1. Correct
-2. Incorrect, should be:  `(++) [1,2,3] [4,5,6]
+2. Incorrect, should be:  `(++) [1,2,3] [4,5,6]`
 3. Correct
 4. Correct
 5. Incorrect, should be:  `"hello" !! 4`