diff --git a/doc/concept.sh b/doc/concept.sh
index 8f355e8..4a2b518 100644
--- a/doc/concept.sh
+++ b/doc/concept.sh
@@ -235,7 +235,7 @@ rnd|rand|random $1 5 13
 
 ## STRING MANIPULATION ##
 # get number $1 as string
-cast $1 str
+cst|cast $1 str
 
 # get utf-8 char with id $1 => $1
 chr $1