The Edit Tag Pattern 
command allows you to change the description of a tag pattern.
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In the Tag Patterns pane, select a master tag pattern.
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In the Tag Patterns pane, click Edit Tag Pattern
to open the Create and Apply Pattern dialog box.
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Type a description or make changes to the description for the tag type in the Description box.
If the Applying pattern to all Sub Classification option is selected, the Description box is read-only.
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Click Save.