diff --git a/01.md b/01.md
index 3ad5d943..c4df803a 100644
--- a/01.md
+++ b/01.md
@@ -77,11 +77,17 @@ To verify the authenticity of an event:
 
 ## Kinds
 
-The `.kind` attribute specifies the meaning of an event, its tags and it is further defined in the various NIPs in this repository
+The `.kind` attribute specifies the meaning of an event and its tags. 
 
-Specific ranges define storage behaviors: 
+Kinds are grouped in 4 numeric ranges to provide explicit storage behaviors for clients and relays: 
+- Regular: All events are stored in disk and will last for as long as possible. 
+- Ephemeral events are to be discared as soon as processed. They are ideal to send commands that should be executed immediatedly or not executed at all.
+- Replaceable events can be quickly updated by newer versions. They are ideal for status events that are always changing and the history of such changes is not important.
+- Parameterized replaceable events extend replaceable kinds to offer an extra identifier as the replacement anchor
 
-| Name          | Range                             | SHOULD retain                                          |
+Ranges and instructions are as follows: 
+
+| Range Name    | Range                             | SHOULD retain                                          |
 | ------------- | --------------------------------- | ------------------------------------------------------ |
 | Regular       | ` 1000 <= kind < 10000`           | All events                                             |
 | Replaceable   | `10000 <= kind < 20000` OR `0, 3` | The newest event for each `pubkey` and `kind`          |
@@ -102,7 +108,7 @@ The first element of the tag array is referred to as the tag _name_ and the seco
 
 All single-letter (only English alphabet letters: a-z, A-Z) tag names are indexed by relays for faster queries. 
 
-This NIP defines the format of 3 standard referencing tags: `e`, `p`, and `a`. Tags `e`, `p` can be used to reference events and pubkeys respectively, and tag `a` references the latest version of a replaceable event. Clients MAY `a`- and `e`-tag parameterized replaceables simultaneously.
+This NIP defines the format of 3 referencing tags: `e`, `p`, and `a`. Tags `e`, `p` can be used to reference events and pubkeys respectively, and tag `a` references the latest version of a replaceable event. Clients MAY `a`- and `e`-tag parameterized replaceables simultaneously.
 
 | Name | Value                                                      | Other Params            |
 | ---- | ---------------------------------------------------------- | ----------------------- |