Merge PR cosmos#202: Add note on non-empty identifiers

ChorusOne · Aug 17, 2019 · c5d2d43 · c5d2d43
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diff --git a/spec.pdf b/spec.pdf
diff --git a/spec/ics-024-host-requirements/README.md b/spec/ics-024-host-requirements/README.md
@@ -29,7 +29,7 @@ IBC should require as simple an interface from the underlying state machine as p
 
 A `Key` is a bytestring used as the key for an object stored in state. Keys MUST contain only alphanumeric characters and the separator `/`.
 
-An `Identifier` is a bytestring used as a key for an object stored in state, such as a connection, channel, or light client. Identifiers MUST consist of alphanumeric characters only.
+An `Identifier` is a bytestring used as a key for an object stored in state, such as a connection, channel, or light client. Identifiers MUST consist of alphanumeric characters only. Identifiers MUST be non-empty (of positive integer length).
 
 Identifiers are not intended to be valuable resources — to prevent name squatting, minimum length requirements or pseudorandom generation MAY be implemented.