diff --git a/administrator/language/en-GB/en-GB.com_fields.ini b/administrator/language/en-GB/en-GB.com_fields.ini
index 9bc03ff64aeee..3d442d1e4b04c 100644
--- a/administrator/language/en-GB/en-GB.com_fields.ini
+++ b/administrator/language/en-GB/en-GB.com_fields.ini
@@ -6,7 +6,7 @@
 COM_FIELDS="Fields"
 COM_FIELDS_BATCH_GROUP_LABEL="To Move or Copy your selection please select a group."
 COM_FIELDS_BATCH_GROUP_OPTION_NONE="- No Group -"
-COM_FIELDS_ERROR_UNIQUE_NAME="Another Field has the same name (remember it may be a trashed item)."
+COM_FIELDS_ERROR_UNIQUE_NAME="Another Field has the same name (remember it may be a trashed item or it may be already present as a custom field in another extension)."
 COM_FIELDS_FIELD_CLASS_DESC="The class attributes of the field in the edit form. If multiple classes are needed, list them with spaces."
 COM_FIELDS_FIELD_CLASS_LABEL="Edit Class"
 COM_FIELDS_FIELD_SHOWLABEL_DESC="Show or Hide the label when the field renders."