diff --git a/documentation/specification.md b/documentation/specification.md
index 015bd10..7c46585 100644
--- a/documentation/specification.md
+++ b/documentation/specification.md
@@ -152,6 +152,7 @@ Echo entry value and exit with success.
 + number of characters to align to
 
 #### specifiers
+These specifiers root mainly from the C stdlib.
 s   : history entry
 n   : entry number
 p   : shell id