diff --git a/src/builtin_structures/find_if_is_substr.py b/src/builtin_structures/find_if_substr.py
similarity index 100%
rename from src/builtin_structures/find_if_is_substr.py
rename to src/builtin_structures/find_if_substr.py
diff --git a/src/builtin_structures/longest_common_prefix.py b/src/builtin_structures/find_longest_common_prefix.py
similarity index 100%
rename from src/builtin_structures/longest_common_prefix.py
rename to src/builtin_structures/find_longest_common_prefix.py
diff --git a/src/builtin_structures/find_long_con_inc_subseq.py b/src/builtin_structures/find_longest_inc_subseq.py
similarity index 100%
rename from src/builtin_structures/find_long_con_inc_subseq.py
rename to src/builtin_structures/find_longest_inc_subseq.py
diff --git a/src/builtin_structures/alpha_permutation.py b/src/builtin_structures/permutations_alphanumeric.py
similarity index 100%
rename from src/builtin_structures/alpha_permutation.py
rename to src/builtin_structures/permutations_alphanumeric.py
diff --git a/src/builtin_structures/generate_prime.py b/src/builtin_structures/primes_generating.py
similarity index 100%
rename from src/builtin_structures/generate_prime.py
rename to src/builtin_structures/primes_generating.py
diff --git a/src/trees/binary_tree.py b/src/trees/binary_tree.py
index 6f7d875..e73d8ff 100755
--- a/src/trees/binary_tree.py
+++ b/src/trees/binary_tree.py
@@ -26,6 +26,7 @@ class Node(object):
             self.right = new_node
         else:
             self.left = self.left._add(value)
+
         return self
 
 
@@ -33,7 +34,7 @@ class Node(object):
         if self.item == value:
             return True # or self
 
-        found = False # or False, thats diff from BST
+        found = False # or None, thats diff from BST
         if self.left:
             found = self.left._search(value)