diff --git a/doc/api/buffer.markdown b/doc/api/buffer.markdown
index b539953e07fa3d..80941cb466bf36 100644
--- a/doc/api/buffer.markdown
+++ b/doc/api/buffer.markdown
@@ -364,7 +364,7 @@ region in the same buffer
     // efghijghijklmnopqrstuvwxyz
 
 
-### buf.slice([start][, end])
+### buf.slice([start[, end]])
 
 * `start` Number, Optional, Default: 0
 * `end` Number, Optional, Default: `buffer.length`