diff --git a/DIRECTORY.md b/DIRECTORY.md
index 89bedfb61..cd8f6fb85 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -209,6 +209,7 @@
   * [Kth Order Statistic](https://github.com/TheAlgorithms/Python/blob/master/divide_and_conquer/kth_order_statistic.py)
   * [Max Subarray Sum](https://github.com/TheAlgorithms/Python/blob/master/divide_and_conquer/max_subarray_sum.py)
   * [Mergesort](https://github.com/TheAlgorithms/Python/blob/master/divide_and_conquer/mergesort.py)
+  * [Peak](https://github.com/TheAlgorithms/Python/blob/master/divide_and_conquer/peak.py)
   * [Power](https://github.com/TheAlgorithms/Python/blob/master/divide_and_conquer/power.py)
   * [Strassen Matrix Multiplication](https://github.com/TheAlgorithms/Python/blob/master/divide_and_conquer/strassen_matrix_multiplication.py)
 
@@ -363,6 +364,7 @@
   * [Random Forest Regressor](https://github.com/TheAlgorithms/Python/blob/master/machine_learning/random_forest_regressor.py)
   * [Scoring Functions](https://github.com/TheAlgorithms/Python/blob/master/machine_learning/scoring_functions.py)
   * [Sequential Minimum Optimization](https://github.com/TheAlgorithms/Python/blob/master/machine_learning/sequential_minimum_optimization.py)
+  * [Similarity Search](https://github.com/TheAlgorithms/Python/blob/master/machine_learning/similarity_search.py)
   * [Support Vector Machines](https://github.com/TheAlgorithms/Python/blob/master/machine_learning/support_vector_machines.py)
   * [Word Frequency Functions](https://github.com/TheAlgorithms/Python/blob/master/machine_learning/word_frequency_functions.py)
 
@@ -455,6 +457,7 @@
     * [Harmonic Series](https://github.com/TheAlgorithms/Python/blob/master/maths/series/harmonic_series.py)
     * [P Series](https://github.com/TheAlgorithms/Python/blob/master/maths/series/p_series.py)
   * [Sieve Of Eratosthenes](https://github.com/TheAlgorithms/Python/blob/master/maths/sieve_of_eratosthenes.py)
+  * [Sigmoid](https://github.com/TheAlgorithms/Python/blob/master/maths/sigmoid.py)
   * [Simpson Rule](https://github.com/TheAlgorithms/Python/blob/master/maths/simpson_rule.py)
   * [Softmax](https://github.com/TheAlgorithms/Python/blob/master/maths/softmax.py)
   * [Square Root](https://github.com/TheAlgorithms/Python/blob/master/maths/square_root.py)
@@ -495,6 +498,7 @@
   * [Autocomplete Using Trie](https://github.com/TheAlgorithms/Python/blob/master/other/autocomplete_using_trie.py)
   * [Binary Exponentiation](https://github.com/TheAlgorithms/Python/blob/master/other/binary_exponentiation.py)
   * [Binary Exponentiation 2](https://github.com/TheAlgorithms/Python/blob/master/other/binary_exponentiation_2.py)
+  * [Davis–Putnam–Logemann–Loveland](https://github.com/TheAlgorithms/Python/blob/master/other/davis–putnam–logemann–loveland.py)
   * [Detecting English Programmatically](https://github.com/TheAlgorithms/Python/blob/master/other/detecting_english_programmatically.py)
   * [Dijkstra Bankers Algorithm](https://github.com/TheAlgorithms/Python/blob/master/other/dijkstra_bankers_algorithm.py)
   * [Doomsday](https://github.com/TheAlgorithms/Python/blob/master/other/doomsday.py)
@@ -662,6 +666,8 @@
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_048/sol1.py)
   * Problem 049
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_049/sol1.py)
+  * Problem 050
+    * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_050/sol1.py)
   * Problem 051
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_051/sol1.py)
   * Problem 052
@@ -723,6 +729,8 @@
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_119/sol1.py)
   * Problem 120
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_120/sol1.py)
+  * Problem 123
+    * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_123/sol1.py)
   * Problem 125
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_125/sol1.py)
   * Problem 173
@@ -749,6 +757,7 @@
   * [Half Adder](https://github.com/TheAlgorithms/Python/blob/master/quantum/half_adder.py)
   * [Not Gate](https://github.com/TheAlgorithms/Python/blob/master/quantum/not_gate.py)
   * [Quantum Entanglement](https://github.com/TheAlgorithms/Python/blob/master/quantum/quantum_entanglement.py)
+  * [Ripple Adder Classic](https://github.com/TheAlgorithms/Python/blob/master/quantum/ripple_adder_classic.py)
   * [Single Qubit Measure](https://github.com/TheAlgorithms/Python/blob/master/quantum/single_qubit_measure.py)
 
 ## Scheduling
@@ -848,6 +857,7 @@
   * [Co2 Emission](https://github.com/TheAlgorithms/Python/blob/master/web_programming/co2_emission.py)
   * [Covid Stats Via Xpath](https://github.com/TheAlgorithms/Python/blob/master/web_programming/covid_stats_via_xpath.py)
   * [Crawl Google Results](https://github.com/TheAlgorithms/Python/blob/master/web_programming/crawl_google_results.py)
+  * [Crawl Google Scholar Citation](https://github.com/TheAlgorithms/Python/blob/master/web_programming/crawl_google_scholar_citation.py)
   * [Current Stock Price](https://github.com/TheAlgorithms/Python/blob/master/web_programming/current_stock_price.py)
   * [Current Weather](https://github.com/TheAlgorithms/Python/blob/master/web_programming/current_weather.py)
   * [Daily Horoscope](https://github.com/TheAlgorithms/Python/blob/master/web_programming/daily_horoscope.py)
diff --git a/Travis_CI_tests_are_failing.md b/Travis_CI_tests_are_failing.md
deleted file mode 100644
index 10bf5a665..000000000
--- a/Travis_CI_tests_are_failing.md
+++ /dev/null
@@ -1,9 +0,0 @@
-# Travis CI test are failing
-### How do I find out what is wrong with my pull request?
-1. In your PR look for the failing test and click the `Details` link: ![Travis_CI_fail_1.png](images/Travis_CI_fail_1.png)
-2. On the next page, click `The build failed` link: ![Travis_CI_fail_2.png](images/Travis_CI_fail_2.png)
-3. Now scroll down and look for `red` text describing the error(s) in the test log.
-
-Pull requests will __not__ be merged if the Travis CI tests are failing.
-
-If anything is unclear, please read through [CONTRIBUTING.md](CONTRIBUTING.md) and attempt to run the failing tests on your computer before asking for assistance.