diff --git a/searches/linear_search.py b/searches/linear_search.py
index f42810092..24479e45b 100644
--- a/searches/linear_search.py
+++ b/searches/linear_search.py
@@ -13,7 +13,7 @@ from __future__ import print_function
 
 
 def linear_search(sequence, target):
-    """Pure implementation of binary search algorithm in Python
+    """Pure implementation of linear search algorithm in Python
 
     :param sequence: some sorted collection with comparable items
     :param target: item value to search
diff --git a/sorts/bubble_sort.py b/sorts/bubble_sort.py
index 3bacb306f..2f14fd65f 100644
--- a/sorts/bubble_sort.py
+++ b/sorts/bubble_sort.py
@@ -30,7 +30,7 @@ def bubble_sort(collection):
     [-45, -5, -2]
     """
     length = len(collection)
-    for i in range(length):
+    for i in range(length-1):
         for j in range(length-1):
             if collection[j] > collection[j+1]:
                 collection[j], collection[j+1] = collection[j+1], collection[j]
diff --git a/sorts/heap_sort.py b/sorts/heap_sort.py
index 822bb6631..f89ae1866 100644
--- a/sorts/heap_sort.py
+++ b/sorts/heap_sort.py
@@ -7,7 +7,7 @@ or
 python3 -m doctest -v heap_sort.py
 
 For manual testing run:
-python insertion_sort.py
+python heap_sort.py
 '''
 
 from __future__ import print_function
@@ -46,7 +46,7 @@ def heap_sort(unsorted):
     n = len(unsorted)
     for i in range(n//2 - 1, -1, -1):
         heapify(unsorted, i, n)
-    for i in range(n - 1, -1, -1):
+    for i in range(n - 1, 0, -1):
         unsorted[0], unsorted[i] = unsorted[i], unsorted[0]
         heapify(unsorted, 0, i)
     return unsorted
diff --git a/sorts/insertion_sort.py b/sorts/insertion_sort.py
index 646ed68ca..347c948df 100644
--- a/sorts/insertion_sort.py
+++ b/sorts/insertion_sort.py
@@ -29,14 +29,10 @@ def insertion_sort(collection):
     >>> insertion_sort([-2, -5, -45])
     [-45, -5, -2]
     """
-    length = len(collection)
-    for i in range(length):
-        current_item = collection[i]
-        j = i - 1
-        while j >= 0 and current_item < collection[j]:
-            collection[j+1] = collection[j]
-            j -= 1
-        collection[j+1] = current_item
+    for index in range(1, len(collection)):
+        while 0 < index and collection[index] < collection[index-1]:
+            collection[index], collection[index-1] = collection[index-1], collection[index]
+            index -= 1
 
     return collection
 
diff --git a/sorts/quick_sort.py b/sorts/quick_sort.py
index f8e61ede4..257c21380 100644
--- a/sorts/quick_sort.py
+++ b/sorts/quick_sort.py
@@ -35,21 +35,20 @@ def quick_sort(collection):
     >>> quick_sort([-2, -5, -45])
     [-45, -5, -2]
     """
+    if len(collection) <= 1:
+        return collection
     less = []
     equal = []
     greater = []
-    if len(collection) > 1:
-        pivot = collection[0]
-        for x in collection:
-            if x < pivot:
-                less.append(x)
-            if x == pivot:
-                equal.append(x)
-            if x > pivot:
-                greater.append(x)
-        return quick_sort(less) + equal + quick_sort(greater)
-    else:
-        return collection
+    pivot = collection[0]
+    for x in collection:
+        if x < pivot:
+            less.append(x)
+        elif x == pivot:
+            equal.append(x)
+        else:
+            greater.append(x)
+    return quick_sort(less) + equal + quick_sort(greater)
 
 
 if __name__ == '__main__':