made iota increment condition more precise
diff --git a/Iota.md b/Iota.md
index f15514c..6126c51 100644
--- a/Iota.md
+++ b/Iota.md
@@ -2,7 +2,7 @@
Go's ` iota ` identifier is used in ` const ` declarations to simplify definitions of incrementing numbers. Because it can be used in expressions, it provides a generality beyond that of simple enumerations.
-The values of iota start at zero within each const block and increment by one each time it is seen. This can be combined with the constant shorthand (leaving out everything after the constant name) to very concisely define related constants.
+The values of iota is reset to 0 whenever the reserved word ` const ` appears in the source (i.e. each const block) and increments by one after each [ConstSpec](https://golang.org/ref/spec#ConstSpec) e.g. each Line. This can be combined with the constant shorthand (leaving out everything after the constant name) to very concisely define related constants.
Iota: http://golang.org/doc/go_spec.html#Iota
