diff --git a/src/base/amo.hh b/src/base/amo.hh
index 44dec8b..23be57d 100644
--- a/src/base/amo.hh
+++ b/src/base/amo.hh
@@ -39,8 +39,13 @@
 
 struct AtomicOpFunctor
 {
+    /**
+     * @ingroup api_atomic_op
+     * @{
+     */
     virtual void operator()(uint8_t *p) = 0;
     virtual AtomicOpFunctor* clone() = 0;
+    /** @} */ // end of api_atomic_op
     virtual ~AtomicOpFunctor() {}
 };
 
@@ -49,6 +54,9 @@
 {
     void operator()(uint8_t *p) { execute((T *)p); }
     virtual AtomicOpFunctor* clone() = 0;
+    /**
+     * @ingroup api_atomic_op
+     */
     virtual void execute(T * p) = 0;
 };
 
@@ -225,6 +233,9 @@
     AtomicOpFunctor* clone () { return new AtomicOpMin(a); }
 };
 
+/**
+ * @ingroup api_atomic_op
+ */
 typedef std::unique_ptr<AtomicOpFunctor> AtomicOpFunctorPtr;
 
 #endif // __BASE_AMO_HH__