diff --git a/docs/pages/release_notes.md b/docs/pages/release_notes.md
index 89a520822b..f8a20d788b 100644
--- a/docs/pages/release_notes.md
+++ b/docs/pages/release_notes.md
@@ -33,6 +33,8 @@ This is a {{ site.pmd.release_type }} release.
 
 ### Fixed Issues
 
+*   apex
+    *   [#1542](https://github.com/pmd/pmd/pull/1542): \[apex] Include the documentation category
 *   java-bestpractices
     *   [#658](https://github.com/pmd/pmd/issues/658): \[java] OneDeclarationPerLine: False positive for loops
     *   [#1518](https://github.com/pmd/pmd/issues/1518): \[java] New rule: AvoidReassigningLoopVariable
diff --git a/pmd-apex/src/main/resources/category/apex/categories.properties b/pmd-apex/src/main/resources/category/apex/categories.properties
index 4c45115d8f..0399dcd41b 100644
--- a/pmd-apex/src/main/resources/category/apex/categories.properties
+++ b/pmd-apex/src/main/resources/category/apex/categories.properties
@@ -6,6 +6,7 @@ rulesets.filenames=\
     category/apex/bestpractices.xml,\
     category/apex/codestyle.xml,\
     category/apex/design.xml,\
+    category/apex/documentation.xml,\
     category/apex/errorprone.xml,\
     category/apex/performance.xml,\
     category/apex/security.xml