diff --git a/sigmf-spec.md b/sigmf-spec.md
index 518f17c..385ffc5 100644
--- a/sigmf-spec.md
+++ b/sigmf-spec.md
@@ -286,8 +286,8 @@ the `global` object:
 |`offset`|false|uint|The index number of the first sample in the dataset. This value defaults to zero. Typically used when a recording is split over multiple files.|
 |`description`|false|string|A text description of the SigMF recording.|
 |`author`|false|string|The author's name (and optionally e-mail address).|
-|`meta-doi`|false|string|The registered DOI (ISO 26324) for a recording's metadata file.|
-|`data-doi`|false|string|The registered DOI (ISO 26324) for a recording's dataset file.|
+|`meta_doi`|false|string|The registered DOI (ISO 26324) for a recording's metadata file.|
+|`data_doi`|false|string|The registered DOI (ISO 26324) for a recording's dataset file.|
 |`recorder`|false|string|The name of the software used to make this SigMF recording.|
 |`license`|false|string|A URL for the license document under which the recording is offered; when possible, use the canonical document provided by the license author, or, failing that, a well-known one.|
 |`hw`|false |string|A text description of the hardware used to make the recording.|