diff --git a/README.md b/README.md
index 520f7b0..2c4743d 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ The following JSON snippet models a contracting process with a participation fee
           "win"
         ],
         "relativeValue": {
-          "percentage": 0.05,
+          "proportion": 0.05,
           "monetaryValue": "award"
         },
         "description": "Fee payable on acceptance of award.",
diff --git a/release-schema.json b/release-schema.json
index 9eb7057..8e80696 100644
--- a/release-schema.json
+++ b/release-schema.json
@@ -39,7 +39,7 @@
         },
         "relativeValue": {
           "title": "Relative value",
-          "description": "The value of the participation fee, as a percentage of the monetary value.",
+          "description": "The value of the participation fee, as a proportion of the monetary value.",
           "$ref": "#/definitions/RelativeValue"
         },
         "description": {
@@ -81,16 +81,16 @@
     },
     "RelativeValue": {
       "title": "Relative value",
-      "description": "The value of the participation fee, as a percentage of a monetary value.",
+      "description": "The value of the participation fee, as a proportion of a monetary value.",
       "type": "object",
       "required": [
-        "percentage",
+        "proportion",
         "monetaryValue"
       ],
       "properties": {
-        "percentage": {
-          "title": "Percentage",
-          "description": "The percentage of the monetary value.",
+        "proportion": {
+          "title": "Proportion",
+          "description": "The percentage of the monetary value, expressed as a decimal proportion between 0 and 1.",
           "type": [
             "number"
           ],