diff --git a/crates/rpc/README.md b/crates/rpc/README.md
index 6f0f40048..9b7c6ca9e 100644
--- a/crates/rpc/README.md
+++ b/crates/rpc/README.md
@@ -37,7 +37,8 @@ Returns a nullifier proof for each of the requested nullifiers.
 
 ### CheckNullifiersByPrefix
 
-Returns a list of nullifiers recorded in the node that match the specified prefixes and block creation height.
+Returns a list of nullifiers recorded in the node that match the specified prefixes and were created at or after 
+the given block height.
 
 Only 16-bit prefixes are supported at this time.