diff --git a/src/backend/postmaster/launch_backend.c b/src/backend/postmaster/launch_backend.c
index 3b5f73524c..cb0c3e2f8a 100644
--- a/src/backend/postmaster/launch_backend.c
+++ b/src/backend/postmaster/launch_backend.c
@@ -208,7 +208,6 @@ child_process_kind child_process_kinds[] = {
 const char *
 PostmasterChildName(BackendType child_type)
 {
-	Assert(child_type >= 0 && child_type < lengthof(child_process_kinds));
 	return child_process_kinds[child_type].name;
 }
 
@@ -230,7 +229,6 @@ postmaster_child_launch(BackendType child_type,
 {
 	pid_t		pid;
 
-	Assert(child_type >= 0 && child_type < lengthof(child_process_kinds));
 	Assert(IsPostmasterEnvironment && !IsUnderPostmaster);
 
 #ifdef EXEC_BACKEND
diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
index f900da6157..90f9b21b25 100644
--- a/src/include/miscadmin.h
+++ b/src/include/miscadmin.h
@@ -326,6 +326,9 @@ extern void SwitchBackToLocalLatch(void);
 
 /*
  * MyBackendType indicates what kind of a backend this is.
+ *
+ * If you add entries, please also update the child_process_kinds array in
+ * launch_backend.c.
  */
 typedef enum BackendType
 {