diff --git a/algebra-jackson/pom.xml b/algebra-jackson/pom.xml
index cbae064..bc4da25 100644
--- a/algebra-jackson/pom.xml
+++ b/algebra-jackson/pom.xml
@@ -59,4 +59,11 @@
       <scope>test</scope>
     </dependency>
   </dependencies>
+
+  <licenses>
+    <license>
+      <name>The Apache License, Version 2.0</name>
+      <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
 </project>
diff --git a/algebra-testing/pom.xml b/algebra-testing/pom.xml
index 1a840be..fb2d68e 100644
--- a/algebra-testing/pom.xml
+++ b/algebra-testing/pom.xml
@@ -28,4 +28,11 @@
       <scope>test</scope>
     </dependency>
   </dependencies>
+
+  <licenses>
+    <license>
+      <name>The Apache License, Version 2.0</name>
+      <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
 </project>
diff --git a/algebra/pom.xml b/algebra/pom.xml
index 6f02e1e..2d0b2dc 100644
--- a/algebra/pom.xml
+++ b/algebra/pom.xml
@@ -55,4 +55,11 @@
       <scope>test</scope>
     </dependency>
   </dependencies>
+
+  <licenses>
+    <license>
+      <name>The Apache License, Version 2.0</name>
+      <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
 </project>