diff --git a/content/page/specs.md b/content/page/specs.md
index fbe40a5164edafbd2314115a39c7f0985512ffe7..f5f29d3a73f0f51baad6aa2b6b2b24b3e6aad92d 100644
--- a/content/page/specs.md
+++ b/content/page/specs.md
@@ -37,6 +37,7 @@ The current version: 0.4.0.
 |----|----|
 | \[…\] | array |
 | string | a sequence of characters, MAY be empty |
+| boolean | `true` or `false` |
 | URL | a valid URL pointing to a resource |
 | MIME type | a valid MIME type according to IANA. See [MDN](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types) |
 | semver | a string matching the pattern `^\d+\.\d+\.\d+$`, representing a semantic version number |
@@ -120,8 +121,8 @@ If the Module Object is set, at least one modules has to be selected.
 
 | Field Name | Cardinality | Type | Description |
 |----|----|----|----|
-| edition-manuscripts | ? | string | `true` or `false` |
-| edition-prints | ? | string | `true` or `false` |
+| edition-manuscripts | ? | boolean | `true` or `false` |
+| edition-prints | ? | boolean | `true` or `false` |
 
 ### Manifest Object
 
diff --git a/schema/module.json b/schema/module.json
index b27d156b3ca8b921eecd809cca5ae176267f909b..47fa25daa54e5a327f363c7357da14bd9715c3a2 100644
--- a/schema/module.json
+++ b/schema/module.json
@@ -12,8 +12,7 @@
     },
     "edition-prints": {
       "description": "module for editions of printed works",
-      "type": "string",
-      "enum": ["true", "false"]
+      "type": "boolean"
     }
   },
   "patternProperties": {