Saltillo ChatFusion 8 User Manual page 297

Example: Dynamic Grammar Labels turned off:
When the "-s" grammar rule key is chosen, "video game" and
"computer game" remain unchanged even though either word will be
pluralized when selected.
Example: Dynamic Grammar Labels turned on:
When the "-s" grammar rule key is chosen, "video game" and
"computer game" change to "video games" and "computer games",
showing how either word will change when selected.
ChatFusion User's Guide 297