diff --git a/graph/encoding/dot/encode.go b/graph/encoding/dot/encode.go
index a0dd25d4..f8d2c1bd 100644
--- a/graph/encoding/dot/encode.go
+++ b/graph/encoding/dot/encode.go
@@ -69,8 +69,7 @@ type Subgrapher interface {
 // Marshal returns the DOT encoding for the graph g, applying the prefix
 // and indent to the encoding. Name is used to specify the graph name. If
 // name is empty and g implements Graph, the returned string from DOTID
-// will be used. If strict is true the output bytes will be prefixed with
-// the DOT "strict" keyword.
+// will be used.
 //
 // Graph serialization will work for a graph.Graph without modification,
 // however, advanced GraphViz DOT features provided by Marshal depend on