diff --git a/pallas-chainsync/src/clients.rs b/pallas-chainsync/src/clients.rs
index e439e8b..a02669c 100644
--- a/pallas-chainsync/src/clients.rs
+++ b/pallas-chainsync/src/clients.rs
@@ -10,8 +10,8 @@ use crate::{BlockBody, Message, State, Tip, WrappedHeader};
 
 /// An observer of chain-sync events sent by the state-machine
 pub trait Observer<C> where C: Debug {
-    fn on_block(&self, content: &C) -> Result<(), Box<dyn std::error::Error>> {
-        log::debug!("asked to save block {:?}", content);
+    fn on_block(&self, cursor: &Option<Point>, content: &C) -> Result<(), Box<dyn std::error::Error>> {
+        log::debug!("asked to save block content {:?} at cursor {:?}", content, cursor);
         Ok(())
     }
 
@@ -127,7 +127,7 @@ where
         }
 
         debug!("reporint block to observer");
-        self.observer.on_block(&content)?;
+        self.observer.on_block(&self.cursor, &content)?;
 
         Ok(Self {
             tip: Some(tip),