diff --git a/docs/evaluate/temporal-cloud/actions.mdx b/docs/evaluate/temporal-cloud/actions.mdx
index 0c6b3a63c0..902039700b 100644
--- a/docs/evaluate/temporal-cloud/actions.mdx
+++ b/docs/evaluate/temporal-cloud/actions.mdx
@@ -107,6 +107,10 @@ available endpoints are listed in the following sections:
 ## Activity {/* #activity */}
 
 - **Activity started or retried**. Occurs each time an Activity is started or retried.
+- **Standalone Activity started**. Occurs when a [Standalone Activity](/standalone-activity) is started.
+  - De-duplicated Standalone Activity starts that return an already-running Activity (sharing an Activity ID) do _not_
+    count as an Action, unless the start request tries to attach a callback to the running Activity — for example,
+    within a Nexus handler using the `USE_EXISTING` conflict policy.
 - **Local Activity started**. All [Local Activities](/local-activity) associated with one Workflow Task count as a
   single Action. Temporal Cloud counts all [RecordMarkers](/references/commands#recordmarker) from each Workflow Task as
   one action, and not _N_ actions. Note: