diff --git a/src/parse_stream.jl b/src/parse_stream.jl
index dcbb52af..412d02b4 100644
--- a/src/parse_stream.jl
+++ b/src/parse_stream.jl
@@ -475,7 +475,7 @@ end
 end
 
 """
-    peek(stream [, n=1]; skip_newlines=false)
+    peek(stream::ParseStream [, n=1]; skip_newlines=false)
 
 Look ahead in the stream `n` tokens, returning the token kind. Comments and
 non-newline whitespace are skipped automatically. Whitespace containing a