diff --git a/proxy/proxycache.go b/proxy/proxycache.go
index 79c2d3e5..89f4c14a 100644
--- a/proxy/proxycache.go
+++ b/proxy/proxycache.go
@@ -103,7 +103,7 @@ func (p *Proxy) cacheResp(d *DNSContext) {
 		// doesn't correspond.
 		if !ecs.IP.Mask(ecs.Mask).Equal(d.ReqECS.IP.Mask(d.ReqECS.Mask)) || ones != reqOnes {
 			p.logger.Debug(
-				"not caching response: ecs does not match",
+				"not caching response; subnet mismatch",
 				"ecs", ecs,
 				"req_ecs", d.ReqECS,
 			)