add iBGP note to readme

README.md

@@ -69,7 +69,10 @@ All peers with an import filter of `cone` will apply further strict filtering by
 All sessions have a default BGP LOCAL_PREF of 100, except for routes tagged with community `65535, 0` ([RFC8326 Graceful Shutdown](https://tools.ietf.org/html/rfc8326)). LOCAL_PREF can be adjusted on a per-peer basis with the `localpref` option under the peer block.
 
 #### Pre-import and Pre-export conditions
-There are many features of BIRD that aren't part of bcg. If you want to add a statement before importing or exporting of routes, you can supply a multiline in `preimport` or `preexport` in the peer block to include that snippet of BIRD code after the import prefilter or before the export filter respectively.
+There are many features of BIRD that aren't part of bcg. If you want to add a statement before importing or exporting of routes, you can supply a multiline string in `pre-import` or `pre-export` in the peer block to include that snippet of BIRD code after the import prefilter or before the export filter respectively.
+
+#### iBGP
+Next hop self will be enabled on BGP sessions where the neighbor ASN and local ASN are the same (iBGP sessions).
 
 #### BGP Communities
 bcg uses RFC 8092 BGP Large Communities