diff --git a/DIRECTORY.md b/DIRECTORY.md
index d1d10942f..5025fde4a 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -586,6 +586,7 @@
   * [Aho-Corasick](https://github.com/TheAlgorithms/Python/blob/master/strings/aho-corasick.py)
   * [Boyer Moore Search](https://github.com/TheAlgorithms/Python/blob/master/strings/boyer_moore_search.py)
   * [Check Pangram](https://github.com/TheAlgorithms/Python/blob/master/strings/check_pangram.py)
+  * [Is Palindrome](https://github.com/TheAlgorithms/Python/blob/master/strings/is_palindrome.py)
   * [Knuth Morris Pratt](https://github.com/TheAlgorithms/Python/blob/master/strings/knuth_morris_pratt.py)
   * [Levenshtein Distance](https://github.com/TheAlgorithms/Python/blob/master/strings/levenshtein_distance.py)
   * [Lower](https://github.com/TheAlgorithms/Python/blob/master/strings/lower.py)
diff --git a/bit_manipulation/README.md b/bit_manipulation/README.md
new file mode 100644
index 000000000..2ef166152
--- /dev/null
+++ b/bit_manipulation/README.md
@@ -0,0 +1,7 @@
+https://docs.python.org/3/reference/expressions.html#binary-bitwise-operations
+https://docs.python.org/3/reference/expressions.html#unary-arithmetic-and-bitwise-operations
+https://docs.python.org/3/library/stdtypes.html#bitwise-operations-on-integer-types
+
+https://wiki.python.org/moin/BitManipulation
+https://wiki.python.org/moin/BitwiseOperators
+https://www.tutorialspoint.com/python3/bitwise_operators_example.htm