diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fbb6659b..6a463f8e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
         uses: gradle/actions/setup-gradle@v4
 
       - name: Build with Gradle
-        run: ./gradlew build jacocoTestReport -i
+        run: ./gradlew build jacocoTestReport javadoc -i
       - uses: codecov/codecov-action@v4
         if: matrix.java == '21'
         env:
diff --git a/build.gradle.kts b/build.gradle.kts
index 96d75275..daf07276 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -75,6 +75,10 @@ subprojects {
             }
         }
 
+        withType<Javadoc> {
+            (options as CoreJavadocOptions).addBooleanOption("Xdoclint:accessibility,html,syntax,reference", true)
+        }
+
         create<Jar>("sourceJar") {
             archiveClassifier.set("sources")
             from(projSourceSets["main"].allSource)
diff --git a/coap-core/src/main/java/com/mbed/coap/packet/HeaderOptions.java b/coap-core/src/main/java/com/mbed/coap/packet/HeaderOptions.java
index 78db289e..248ec96d 100644
--- a/coap-core/src/main/java/com/mbed/coap/packet/HeaderOptions.java
+++ b/coap-core/src/main/java/com/mbed/coap/packet/HeaderOptions.java
@@ -25,7 +25,7 @@
  * - RFC 7959 (Block-Wise Transfers)
  * - draft-ietf-core-observe-09
  * - RFC 9175 (Echo, Request-Tag, and Token Processing)
- * <p/>
+ * <p>
  * And custom:
  * <pre>
  *    +-----+---+---+---+---+----------------+--------+--------+----------+