diff --git a/doc/api/inspector.md b/doc/api/inspector.md
index 27a7c656136196..a699b6c16a68b5 100644
--- a/doc/api/inspector.md
+++ b/doc/api/inspector.md
@@ -325,6 +325,10 @@ by V8. Chrome DevTools Protocol domain provides an interface for interacting
 with one of the runtime agents used to inspect the application state and listen
 to the run-time events.
 
+You can not set `reportProgress` to `true` when sending a
+`HeapProfiler.takeHeapSnapshot` or `HeapProfiler.stopTrackingHeapObjects`
+command to V8.
+
 #### Example usage
 
 Apart from the debugger, various V8 Profilers are available through the DevTools
diff --git a/doc/api/v8.md b/doc/api/v8.md
index 9fe79556b6011a..bd56168b49ad09 100644
--- a/doc/api/v8.md
+++ b/doc/api/v8.md
@@ -1081,7 +1081,7 @@ Start collecting GC data.
 added: REPLACEME
 -->
 
-Stop collecting GC data and return a object.The content of object
+Stop collecting GC data and return an object.The content of object
 is as follows.
 
 ```json