diff --git a/01.md b/01.md
index e2b4ad4..f7f592c 100644
--- a/01.md
+++ b/01.md
@@ -78,8 +78,8 @@ This NIP defines 3 standard tags that can be used across all event kinds with th
 - The `e` tag, used to refer to an event: `["e", <32-bytes lowercase hex of the id of another event>, <recommended relay URL, optional>, <32-bytes lowercase hex of the author's pubkey, optional>]`
 - The `p` tag, used to refer to another user: `["p", <32-bytes lowercase hex of a pubkey>, <recommended relay URL, optional>]`
 - The `a` tag, used to refer to an addressable or replaceable event
-    - for an addressable event: `["a", <kind integer>:<32-bytes lowercase hex of a pubkey>:<d tag value>, <recommended relay URL, optional>]`
-    - for a normal replaceable event: `["a", <kind integer>:<32-bytes lowercase hex of a pubkey>:, <recommended relay URL, optional>]`
+    - for an addressable event: `["a", "<kind integer>:<32-bytes lowercase hex of a pubkey>:<d tag value>", <recommended relay URL, optional>]`
+    - for a normal replaceable event: `["a", "<kind integer>:<32-bytes lowercase hex of a pubkey>:", <recommended relay URL, optional>]` (note: include the trailing colon)
 
 As a convention, all single-letter (only english alphabet letters: a-z, A-Z) key tags are expected to be indexed by relays, such that it is possible, for example, to query or subscribe to events that reference the event `"5c83da77af1dec6d7289834998ad7aafbd9e2191396d75ec3cc27f5a77226f36"` by using the `{"#e": ["5c83da77af1dec6d7289834998ad7aafbd9e2191396d75ec3cc27f5a77226f36"]}` filter. Only the first value in any given tag is indexed.