https://devzone.nordicsemi.com/f/nordic-q-a/26368/when-we-encounter-comments-saying-refer-ref-where-is-the-reference-atFor example: /**&lt; Value location, see @ref BLE_GATTS_VLOCS.*/ And for the love of GOD I cannot find these references anywhere !! Help Please.en-USTelligent Community 13Fri, 27 Oct 2017 11:13:39 GMThttps://devzone.nordicsemi.com/thread/103764?ContentTypeID=1Fri, 27 Oct 2017 11:13:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b25efdd5-615f-44ac-8672-459d08d100f3MartinBL<p>Those particular references are located in ble_gatts.h. A hint is found in the name (BLE_GATTS_), but it is not a given that it is like this in all cases. The way I typically look up references like this is to do a project vide search in all files for whatever the reference is. I suppose it can be confusing that BLE_GATTS_VLOCS seems to be written in plural while the actual define is singular BLE_GATTS_VLOC_something</p> <p>This is how it looks in Keil:</p> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/ref.PNG" alt="ref" /></p><div style="clear:both;"></div>