diff --git a/doc/api/diagnostics_channel.md b/doc/api/diagnostics_channel.md
index 019fe9a6614b9d..8f62cd3c632e81 100644
--- a/doc/api/diagnostics_channel.md
+++ b/doc/api/diagnostics_channel.md
@@ -409,6 +409,12 @@ channel.unsubscribe(onMessage);
 
 ### Built-in Channels
 
+> Stability: 1 - Experimental
+
+While the diagnostics\_channel API is now considered stable, the built-in
+channels currently available are not. Each channel must be declared stable
+independently.
+
 #### HTTP
 
 `http.client.request.start`
diff --git a/src/node_contextify.cc b/src/node_contextify.cc
index 45c5b33b634a22..d9036cb56ad2b2 100644
--- a/src/node_contextify.cc
+++ b/src/node_contextify.cc
@@ -1407,6 +1407,17 @@ void Initialize(Local<Object> target,
 
   READONLY_PROPERTY(constants, "measureMemory", measure_memory);
 
+  Local<Object> loop_mode = Object::New(env->isolate());
+  {
+    uv_run_mode DEFAULT = UV_RUN_DEFAULT;
+    uv_run_mode ONCE = UV_RUN_ONCE;
+    uv_run_mode NOWAIT = UV_RUN_NOWAIT;
+    NODE_DEFINE_CONSTANT(loop_mode, DEFAULT);
+    NODE_DEFINE_CONSTANT(loop_mode, ONCE);
+    NODE_DEFINE_CONSTANT(loop_mode, NOWAIT);
+    READONLY_PROPERTY(constants, "loopMode", loop_mode);
+  }
+
   target->Set(context, env->constants_string(), constants).Check();
 
   SetMethod(context, target, "measureMemory", MeasureMemory);