diff --git a/specs/phase0/p2p-interface.md b/specs/phase0/p2p-interface.md
index b214c458d..c0580fafd 100644
--- a/specs/phase0/p2p-interface.md
+++ b/specs/phase0/p2p-interface.md
@@ -548,7 +548,7 @@ The request MUST be encoded as an SSZ-container.
 
 The response MUST consist of zero or more `response_chunk`. Each _successful_ `response_chunk` MUST contain a single `SignedBeaconBlock` payload.
 
-Clients MUST keep a record of signed blocks seen since the since the start of the weak subjectivity period and MUST support requesting blocks up to the given `head_block_root`.
+Clients MUST keep a record of signed blocks seen since the since the start of the weak subjectivity period and MUST support serving requests of blocks up to their own `head_block_root`.
 
 Clients MUST respond with at least one block, if they have it and it exists in the range. Clients MAY limit the number of blocks in the response.