Make "parameters" singular

model/Build/Classes/Build.md

@@ -49,7 +49,7 @@ simplify creating reproducible builds.
 - configSourceDigest
   - type: /Core/Hash
   - minCount: 0
-- parameters
+- parameter
   - type: /Core/DictionaryEntry
   - minCount: 0
 - buildStartTime

model/Build/Properties/parameter.md

@@ -0,0 +1,20 @@
+SPDX-License-Identifier: Community-Spec-1.0
+
+# parameter
+
+## Summary
+
+Property describing a parameter used in an instance of a build.
+
+## Description
+
+parameter is a key-value of a build parameter and its value that
+was provided to the builder for a build instance. This is different from the
+[environment](environment.md) property in that the key and value are provided
+as command line arguments or a configuration file to the builder.
+
+## Metadata
+
+- name: parameter
+- Nature: ObjectProperty
+- Range: /Core/DictionaryEntry