diff --git a/docs/dcc-tables.md b/docs/dcc-tables.md
index 5c6701a..874ff19 100644
--- a/docs/dcc-tables.md
+++ b/docs/dcc-tables.md
@@ -75,7 +75,7 @@ Leave blank if not required.
 
 ### PRE_EDIT_HOOK
 
-[Hook script](#hook-scripts) to execute _prior_ to an edit being made. This allows data to be modified before being presented for editing.
+[Hook script](#hook-scripts) to execute _prior_ to an edit being made. This allows data to be modified before being presented for editing, or for display formats to be applied.
 
 Leave blank if not required.
 
@@ -112,7 +112,7 @@ This [hook script](#hook-scripts) will execute twice during a typical workflow -
 
 This makes it a helpful place to prevent changes being made, eg in situations where the target table needs to be locked by alternative systems.
 
-It can also be used to apply display formats.
+It can also be used to apply display formats, or to prepare any 'system' columns such as "APPROVER_NM".
 
 Leave blank if not required.