diff --git a/src/common-principles.md b/src/common-principles.md
index 0285a3704d..6156cf0f65 100644
--- a/src/common-principles.md
+++ b/src/common-principles.md
@@ -466,6 +466,7 @@ and a guide for using macros can be found at
         ),
         "Levels": "RECOMMENDED",
         "Units": "RECOMMENDED",
+        "Delimiter": "OPTIONAL",
         "TermURL": "RECOMMENDED",
         "HED": "OPTIONAL",
    }
diff --git a/src/schema/objects/columns.yaml b/src/schema/objects/columns.yaml
index 5c9e6fd1c8..7e101d1fc5 100644
--- a/src/schema/objects/columns.yaml
+++ b/src/schema/objects/columns.yaml
@@ -53,6 +53,7 @@ channel:
     If multiple channels are specified, separate with commas (`,`) or a
     delimiter specified in the `"Delimiter"` field describing the `channel`
     column.
+  type: string
 color:
   name: color
   display_name: Color label
diff --git a/src/schema/objects/metadata.yaml b/src/schema/objects/metadata.yaml
index 75fede833f..e0cee9ec10 100644
--- a/src/schema/objects/metadata.yaml
+++ b/src/schema/objects/metadata.yaml
@@ -574,6 +574,13 @@ DelayTime:
     This field is mutually exclusive with `"VolumeTiming"`.
   type: number
   unit: s
+Delimiter:
+  name: Delimiter
+  display_name: Delimiter
+  description: |
+    If a column may be interpreted as a list of values, the character that
+    separates one value from the next.
+  type: string
 Density:
   name: Density
   display_name: Density