diff --git a/scrape/scrape_append_v2.go b/scrape/scrape_append_v2.go
index e723c52744..2c27845530 100644
--- a/scrape/scrape_append_v2.go
+++ b/scrape/scrape_append_v2.go
@@ -261,6 +261,7 @@ loop:
 				st = p.StartTimestamp()
 			}
 
+			// TODO(ridwanmsharif): Consider injecting a 0 value with the st == t here, instead of skipping an append.
 			if sl.synthesizeST && st == 0 {
 				st, val, h, fh, skipAppend, stCache = sl.checkAndSynthesizeStartTime(st, lset, ce, lastMFName, val, h, fh, t)
 			}
diff --git a/scrape/st_synthesis.go b/scrape/st_synthesis.go
index ba7d140da5..f7f2c0f5ab 100644
--- a/scrape/st_synthesis.go
+++ b/scrape/st_synthesis.go
@@ -26,6 +26,7 @@ import (
 // It maps closely to OpenTelemetry's cumulative-to-delta conversion patterns,
 // similar to what is done in the OpenTelemetry Collector's `metricstarttimeprocessor`.
 // See https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/processor/metricstarttimeprocessor.
+// TODO(ridwanmsharif): Make this a struct usable by a go interface (see https://github.com/prometheus/prometheus/pull/18279#discussion_r3032221849).
 type stCache struct {
 	f  *floatSynthesis
 	h  *histogramSynthesis