diff --git a/eth/gasprice/feehistory.go b/eth/gasprice/feehistory.go
index d039bcb401..540ca47226 100644
--- a/eth/gasprice/feehistory.go
+++ b/eth/gasprice/feehistory.go
@@ -44,7 +44,9 @@ const (
 	// maxBlockFetchers is the max number of goroutines to spin up to pull blocks
 	// for the fee history calculation (mostly relevant for LES).
 	maxBlockFetchers = 4
-	maxQueryLimit    = 100
+	// maxQueryLimit is the max number of requested percentiles
+	// for defending DDoS attacks.
+	maxQueryLimit = 100
 )
 
 // blockFees represents a single block for processing