diff --git a/brillo/process_reaper.h b/brillo/process_reaper.h
index d88f572..937c88c 100644
--- a/brillo/process_reaper.h
+++ b/brillo/process_reaper.h
@@ -44,6 +44,13 @@
                      pid_t pid,
                      const ChildCallback& callback);
 
+  // Stop watching child process |pid|.  This is useful in situations
+  // where the child process may have been reaped outside of the signal
+  // handler, or the caller is no longer interested in being notified about
+  // this child process anymore.  Returns true if a child was removed from
+  // the watchlist.
+  bool ForgetChild(pid_t pid);
+
  private:
   // SIGCHLD handler for the AsynchronousSignalHandler. Always returns false
   // (meaning that the signal handler should not be unregistered).