diff --git a/proc/pids.h b/proc/pids.h
index 35e3d1b8..68d9ddcd 100644
--- a/proc/pids.h
+++ b/proc/pids.h
@@ -134,7 +134,8 @@ enum pids_item {
     PROCPS_PIDS_VSIZE_PGS,             // ul_int
     PROCPS_PIDS_WCHAN_ADDR,            // addr
     PROCPS_PIDS_WCHAN_NAME,            // str
-    PROCPS_PIDS_noop                   // n/a
+    PROCPS_PIDS_extra,                 //         ( reset to zero )
+    PROCPS_PIDS_noop                   //         ( never altered )
 };
 
 enum pids_fill_type {