diff --git a/.all-contributorsrc b/.all-contributorsrc
index 3f43c9675..df2e3e857 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -299,6 +299,51 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "qza",
+      "name": "qza",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/233149?v=4",
+      "profile": "https://github.com/qza",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "Tschis",
+      "name": "Rodolfo Forte",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/20662669?v=4",
+      "profile": "http://tschis.github.io",
+      "contributions": [
+        "content"
+      ]
+    },
+    {
+      "login": "ankurkaushal",
+      "name": "Ankur Kaushal",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/2236616?v=4",
+      "profile": "https://github.com/ankurkaushal",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "okinskas",
+      "name": "Ovidijus Okinskas",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/20372387?v=4",
+      "profile": "https://www.linkedin.com/in/ovidijus-okinskas/",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "robertt240",
+      "name": "Robert Kasperczyk",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/9137432?v=4",
+      "profile": "https://github.com/robertt240",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 4,
diff --git a/README.md b/README.md
index 2dad39226..94615bf9c 100644
--- a/README.md
+++ b/README.md
@@ -115,6 +115,11 @@ This project is licensed under the terms of the MIT license.
     <td align="center"><a href="https://github.com/SrdjanPaunovic"><img src="https://avatars1.githubusercontent.com/u/22815104?v=4" width="100px;" alt=""/><br /><sub><b>Srđan Paunović</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=SrdjanPaunovic" title="Code">💻</a></td>
     <td align="center"><a href="https://sideris.xyz/"><img src="https://avatars3.githubusercontent.com/u/5484694?v=4" width="100px;" alt=""/><br /><sub><b>Petros G. Sideris</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=sideris" title="Code">💻</a></td>
     <td align="center"><a href="https://twitter.com/StPitsios"><img src="https://avatars1.githubusercontent.com/u/6773603?v=4" width="100px;" alt=""/><br /><sub><b>Stamatis Pitsios</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=pitsios-s" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/qza"><img src="https://avatars3.githubusercontent.com/u/233149?v=4" width="100px;" alt=""/><br /><sub><b>qza</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=qza" title="Code">💻</a></td>
+    <td align="center"><a href="http://tschis.github.io"><img src="https://avatars1.githubusercontent.com/u/20662669?v=4" width="100px;" alt=""/><br /><sub><b>Rodolfo Forte</b></sub></a><br /><a href="#content-Tschis" title="Content">🖋</a></td>
+    <td align="center"><a href="https://github.com/ankurkaushal"><img src="https://avatars2.githubusercontent.com/u/2236616?v=4" width="100px;" alt=""/><br /><sub><b>Ankur Kaushal</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ankurkaushal" title="Code">💻</a></td>
+    <td align="center"><a href="https://www.linkedin.com/in/ovidijus-okinskas/"><img src="https://avatars0.githubusercontent.com/u/20372387?v=4" width="100px;" alt=""/><br /><sub><b>Ovidijus Okinskas</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=okinskas" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/robertt240"><img src="https://avatars1.githubusercontent.com/u/9137432?v=4" width="100px;" alt=""/><br /><sub><b>Robert Kasperczyk</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=robertt240" title="Code">💻</a></td>
   </tr>
 </table>