diff --git a/promql/engine.go b/promql/engine.go
index b37206fca..bdc9883ba 100644
--- a/promql/engine.go
+++ b/promql/engine.go
@@ -574,7 +574,7 @@ func (ng *Engine) populateSeries(ctx context.Context, q storage.Queryable, s *Ev
 
 		// We need to make sure we select the timerange selected by the subquery.
 		// TODO(gouthamve): cumulativeSubqueryOffset gives the sum of range and the offset
-		// we can optimise it by separating out the range and offsets, and substracting the offsets
+		// we can optimise it by separating out the range and offsets, and subtracting the offsets
 		// from end also.
 		subqOffset := ng.cumulativeSubqueryOffset(path)
 		offsetMilliseconds := durationMilliseconds(subqOffset)