diff --git a/ctclient/rfc6962.go b/ctclient/rfc6962.go
index 991aa5c..0f44d3b 100644
--- a/ctclient/rfc6962.go
+++ b/ctclient/rfc6962.go
@@ -24,7 +24,7 @@ import (
 type RFC6962Log struct {
 	URL               *url.URL
 	MaxGetEntriesSize uint64
-	HTTPClient        *http.Client
+	HTTPClient        *http.Client // nil to use default client
 }
 
 type RFC6962LogEntry struct {
diff --git a/ctclient/static.go b/ctclient/static.go
index da5a2d0..93cef73 100644
--- a/ctclient/static.go
+++ b/ctclient/static.go
@@ -37,7 +37,7 @@ type StaticLog struct {
 	SubmissionURL *url.URL
 	MonitoringURL *url.URL
 	ID            cttypes.LogID
-	HTTPClient    *http.Client
+	HTTPClient    *http.Client // nil to use default client
 }
 
 type StaticLogEntry struct {