1 files changed, 2 insertions, 2 deletions

diff --git a/C0.md b/C0.md
index c88e145..dcb72c6 100644
--- a/C0.md
+++ b/C0.md
@@ -23,9 +23,9 @@ The `.content` field contains the actual code snippet text.
 - `extension` - File extension (without the dot). Examples: "js", "py", "rs"
 - `description` - Brief description of what the code does
 - `runtime` - Runtime or environment specification (e.g., "node v18.15.0", "python 3.11")
-- `license` - License under which the code is shared (e.g., "MIT", "GPL-3.0", "Apache-2.0")
+- `license` - License under which the code (along with any related data contained within the event, when available, such as the description) is shared. This MUST be a standard [SPDX](https://spdx.org/licenses/) short identifier (e.g., "MIT", "GPL-3.0-or-later", "Apache-2.0") when available. An additional parameter containing a reference to the actual text of the license MAY be provided. This tag can be repeated, to indicate multi-licensing, allowing recipients to use the code under any license of choosing among the referenced ones
 - `dep` - Dependency required for the code to run (can be repeated)
-- `repo` - Reference to a repository where this code originates
+- `repo` - Reference to a repository where this code originates. This MUST be a either standard URL or, alternatively, the address of a [NIP-34](34.md) Git repository annoucement event in the form `"30617:<32-bytes hex a pubkey>:<d tag value>"`. If a repository announcement is referenced, a recommended relay URL where to find the event should be provided as an additional parameter
 
 ## Format