diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 458075a282a67b57496a59ac20630444356d01ee..53460c97d02edbfa86cf4652579ffecf2c895fd2 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -1,3 +1,26 @@
+#
+# The MIT License
+# Copyright © 2014-2019 Ilkka Seppälä
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+
 # This workflow will build a Java project with Maven
 # For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
 
diff --git a/strangler/etc/strangler.urm.puml b/strangler/etc/strangler.urm.puml
new file mode 100644
index 0000000000000000000000000000000000000000..afbe4d49988a147b58805338b8d1c8652dc64e32
--- /dev/null
+++ b/strangler/etc/strangler.urm.puml
@@ -0,0 +1,61 @@
+@startuml
+package com.iluwatar.strangler {
+  class App {
+    + App()
+    + main(args : String[]) {static}
+  }
+  class HalfArithmetic {
+    - LOGGER : Logger {static}
+    - VERSION : String {static}
+    - newSource : HalfSource
+    - oldSource : OldSource
+    + HalfArithmetic(newSource : HalfSource, oldSource : OldSource)
+    + ifHasZero(nums : int[]) : boolean
+    + mul(nums : int[]) : int
+    + sum(nums : int[]) : int
+  }
+  class HalfSource {
+    - LOGGER : Logger {static}
+    - VERSION : String {static}
+    + HalfSource()
+    + accumulateSum(nums : int[]) : int
+    + ifNonZero(nums : int[]) : boolean
+  }
+  class NewArithmetic {
+    - LOGGER : Logger {static}
+    - VERSION : String {static}
+    - source : NewSource
+    + NewArithmetic(source : NewSource)
+    + ifHasZero(nums : int[]) : boolean
+    + mul(nums : int[]) : int
+    + sum(nums : int[]) : int
+  }
+  class NewSource {
+    - LOGGER : Logger {static}
+    - VERSION : String {static}
+    + NewSource()
+    + accumulateMul(nums : int[]) : int
+    + accumulateSum(nums : int[]) : int
+    + ifNonZero(nums : int[]) : boolean
+  }
+  class OldArithmetic {
+    - LOGGER : Logger {static}
+    - VERSION : String {static}
+    - source : OldSource
+    + OldArithmetic(source : OldSource)
+    + mul(nums : int[]) : int
+    + sum(nums : int[]) : int
+  }
+  class OldSource {
+    - LOGGER : Logger {static}
+    - VERSION : String {static}
+    + OldSource()
+    + accumulateMul(nums : int[]) : int
+    + accumulateSum(nums : int[]) : int
+  }
+}
+OldArithmetic -->  "-source" OldSource
+NewArithmetic -->  "-source" NewSource
+HalfArithmetic -->  "-newSource" HalfSource
+HalfArithmetic -->  "-oldSource" OldSource
+@enduml
\ No newline at end of file