diff --git a/sf-writer/src/ImageAssembler.cpp b/sf-writer/src/ImageAssembler.cpp
index 153c7d7..3e45fcf 100644
--- a/sf-writer/src/ImageAssembler.cpp
+++ b/sf-writer/src/ImageAssembler.cpp
@@ -107,6 +107,10 @@ ImageMetadataBlock* ImageAssembler::get_metadata_buffer(const uint64_t bunch_id)
     auto meta_offset = get_metadata_offset(slot_id, 0);
     const auto meta_offset_step = 1;
 
+    meta_buffer_->block_start_pulse_id = bunch_id * BUFFER_BLOCK_SIZE;
+    meta_buffer_->block_stop_pulse_id =
+            meta_buffer_->block_start_pulse_id + BUFFER_BLOCK_SIZE - 1;
+
     for (size_t i_pulse=0; i_pulse < BUFFER_BLOCK_SIZE; i_pulse++) {
 
         auto is_pulse_init = false;