update readme with notice

README.MD

@@ -101,9 +101,9 @@ If you find any crashes or incompatibilities, don't hesitate to open an issue.
 
 ## Depending On Metadata Increase In Another Mod
 
-**NOTE:** This API is available as of version <!--TODO--> of EndlessIDs.
+**NOTE:** This API is available as of version TODO of EndlessIDs.
 
-EndlessIDs implements the common ID Extender API added in NotEnoughIDs Unofficial. See:
+EndlessIDs implements the common ID Extender API introduced in NotEnoughIDs Unofficial. See:
 https://github.com/GTNewHorizons/NotEnoughIds/pull/17
 
 The description below is an excerpt of NEID-U's readme concerning this API:
@@ -135,6 +135,10 @@ if (Loader.isModLoaded("idextender")){
 }
 ```
 
+Note that these values CAN be identical to the vanilla values if the ID Extension mod implementing it has a config to
+toggle itself, existence of the IDExtender class does not guarantee a fixed increase, and you should check that the
+returned value is large enough for your needs. 
+
 If for some reason, you need to know what parent mod is providing the `idextender` mod, you can do the following, which will give you
 back the Mod ID of the actual mod that has provided `idextender`. For example, `endlessids`: