diff --git a/src/packagedcode/cargo.py b/src/packagedcode/cargo.py
index 3b2d342d828..aef4b78cb17 100644
--- a/src/packagedcode/cargo.py
+++ b/src/packagedcode/cargo.py
@@ -228,12 +228,12 @@ def parse(cls, location, package_only=False):
 
         vcs_url = core_package_data.get('repository')
         homepage_url = core_package_data.get('homepage')
+        documentation_url = core_package_data.get('documentation')
         repository_homepage_url = name and f'https://crates.io/crates/{name}'
         repository_download_url = name and version and f'https://crates.io/api/v1/crates/{name}/{version}/download'
         api_data_url = name and f'https://crates.io/api/v1/crates/{name}'
 
         extra_data_mappings = {
-            "documentation": "documentation_url",
             "rust-version": "rust_version",
             "edition": "rust_edition",
         }
@@ -254,6 +254,7 @@ def parse(cls, location, package_only=False):
             extracted_license_statement=extracted_license_statement,
             vcs_url=vcs_url,
             homepage_url=homepage_url,
+            documentation_url=documentation_url,
             repository_homepage_url=repository_homepage_url,
             repository_download_url=repository_download_url,
             api_data_url=api_data_url,
diff --git a/src/packagedcode/models.py b/src/packagedcode/models.py
index 0c4ffb9e56e..781d696ee14 100644
--- a/src/packagedcode/models.py
+++ b/src/packagedcode/models.py
@@ -618,6 +618,10 @@ class PackageData(IdentifiablePackageData):
               'See SPDX specification "Package Download Location" '
               'at https://spdx.org/spdx-specification-21-web-version#h.49x2ik5 ')
 
+    documentation_url = String(
+        label='documentation URL',
+        help='URL to the documentation for this package.')
+
     copyright = String(
         label='Copyright',
         help='Copyright statements for this package. Typically one per line.')
diff --git a/tests/packagedcode/data/cargo/cargo_toml/boring-child/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/boring-child/Cargo.toml.expected
index 272e43f6a48..1b4092a4e0e 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/boring-child/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/boring-child/Cargo.toml.expected
@@ -46,6 +46,7 @@
     "bug_tracking_url": null,
     "code_view_url": null,
     "vcs_url": null,
+    "documentation_url": "https://docs.rs/boring-sys",
     "copyright": null,
     "holder": null,
     "declared_license_expression": "mit",
@@ -86,8 +87,7 @@
     "extra_data": {
       "version": "workspace",
       "repository": "workspace",
-      "edition": "workspace",
-      "documentation_url": "https://docs.rs/boring-sys"
+      "edition": "workspace"
     },
     "dependencies": [
       {
diff --git a/tests/packagedcode/data/cargo/cargo_toml/boring-main/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/boring-main/Cargo.toml.expected
index a58452ebb84..e4cf9369cfe 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/boring-main/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/boring-main/Cargo.toml.expected
@@ -21,6 +21,7 @@
     "bug_tracking_url": null,
     "code_view_url": null,
     "vcs_url": null,
+    "documentation_url": null,
     "copyright": null,
     "holder": null,
     "declared_license_expression": null,
diff --git a/tests/packagedcode/data/cargo/cargo_toml/clap/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/clap/Cargo.toml.expected
index 79b0a84c7c8..05fc95db445 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/clap/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/clap/Cargo.toml.expected
@@ -36,6 +36,7 @@
     "bug_tracking_url": null,
     "code_view_url": null,
     "vcs_url": "https://github.com/clap-rs/clap",
+    "documentation_url": "https://docs.rs/clap/",
     "copyright": null,
     "holder": null,
     "declared_license_expression": "mit",
@@ -73,9 +74,7 @@
     "file_references": [],
     "is_private": false,
     "is_virtual": false,
-    "extra_data": {
-      "documentation_url": "https://docs.rs/clap/"
-    },
+    "extra_data": {},
     "dependencies": [
       {
         "purl": "pkg:cargo/bitflags",
diff --git a/tests/packagedcode/data/cargo/cargo_toml/clippy/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/clippy/Cargo.toml.expected
index e2566ada19f..dcb4a691a78 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/clippy/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/clippy/Cargo.toml.expected
@@ -63,6 +63,7 @@
     "bug_tracking_url": null,
     "code_view_url": null,
     "vcs_url": "https://github.com/rust-lang/rust-clippy",
+    "documentation_url": null,
     "copyright": null,
     "holder": null,
     "declared_license_expression": "mit OR apache-2.0",
diff --git a/tests/packagedcode/data/cargo/cargo_toml/mdbook/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/mdbook/Cargo.toml.expected
index f9489676f83..9cd00c8c958 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/mdbook/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/mdbook/Cargo.toml.expected
@@ -48,6 +48,7 @@
     "bug_tracking_url": null,
     "code_view_url": null,
     "vcs_url": "https://github.com/rust-lang-nursery/mdBook",
+    "documentation_url": "http://rust-lang-nursery.github.io/mdBook/index.html",
     "copyright": null,
     "holder": null,
     "declared_license_expression": "mpl-2.0",
@@ -85,9 +86,7 @@
     "file_references": [],
     "is_private": false,
     "is_virtual": false,
-    "extra_data": {
-      "documentation_url": "http://rust-lang-nursery.github.io/mdBook/index.html"
-    },
+    "extra_data": {},
     "dependencies": [
       {
         "purl": "pkg:cargo/clap",
diff --git a/tests/packagedcode/data/cargo/cargo_toml/rustfmt/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/rustfmt/Cargo.toml.expected
index 6b0af2acdec..79013427b28 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/rustfmt/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/rustfmt/Cargo.toml.expected
@@ -38,6 +38,7 @@
     "bug_tracking_url": null,
     "code_view_url": null,
     "vcs_url": "https://github.com/rust-lang/rustfmt",
+    "documentation_url": null,
     "copyright": null,
     "holder": null,
     "declared_license_expression": "apache-2.0 OR mit",
diff --git a/tests/packagedcode/data/cargo/cargo_toml/rustup/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/rustup/Cargo.toml.expected
index 6a60afc8816..ad08f3ae54a 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/rustup/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/rustup/Cargo.toml.expected
@@ -34,6 +34,7 @@
     "bug_tracking_url": null,
     "code_view_url": null,
     "vcs_url": "https://github.com/rust-lang/rustup.rs",
+    "documentation_url": "http://rust-lang.github.io/rustup.rs/rustup/index.html",
     "copyright": null,
     "holder": null,
     "declared_license_expression": "mit OR apache-2.0",
@@ -77,7 +78,6 @@
           "src/download"
         ]
       },
-      "documentation_url": "http://rust-lang.github.io/rustup.rs/rustup/index.html",
       "rust_edition": "2018"
     },
     "dependencies": [
diff --git a/tests/packagedcode/data/cargo/cargo_toml/single-file-scan/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/single-file-scan/Cargo.toml.expected
index ff00223cc82..dc5ab7516e2 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/single-file-scan/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/single-file-scan/Cargo.toml.expected
@@ -40,6 +40,7 @@
           "bug_tracking_url": null,
           "code_view_url": null,
           "vcs_url": "https://github.com/cesarb/constant_time_eq",
+          "documentation_url": "https://docs.rs/constant_time_eq",
           "copyright": null,
           "holder": null,
           "declared_license_expression": "cc0-1.0 OR mit-0 OR apache-2.0",
@@ -78,7 +79,6 @@
           "is_private": false,
           "is_virtual": false,
           "extra_data": {
-            "documentation_url": "https://docs.rs/constant_time_eq",
             "rust_version": "1.85.0",
             "rust_edition": "2024"
           },
diff --git a/tests/packagedcode/data/cargo/cargo_toml/tauri-examples/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/tauri-examples/Cargo.toml.expected
index c07f809f9c5..4fce2752f5d 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/tauri-examples/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/tauri-examples/Cargo.toml.expected
@@ -21,6 +21,7 @@
     "bug_tracking_url": null,
     "code_view_url": null,
     "vcs_url": null,
+    "documentation_url": null,
     "copyright": null,
     "holder": null,
     "declared_license_expression": null,
diff --git a/tests/packagedcode/data/cargo/cargo_toml/tauri/Cargo.toml.expected b/tests/packagedcode/data/cargo/cargo_toml/tauri/Cargo.toml.expected
index 25b7f94cd55..ae87e3cb414 100644
--- a/tests/packagedcode/data/cargo/cargo_toml/tauri/Cargo.toml.expected
+++ b/tests/packagedcode/data/cargo/cargo_toml/tauri/Cargo.toml.expected
@@ -21,6 +21,7 @@
     "bug_tracking_url": null,
     "code_view_url": null,
     "vcs_url": null,
+    "documentation_url": null,
     "copyright": null,
     "holder": null,
     "declared_license_expression": null,
diff --git a/tests/packagedcode/data/models/full-expected.json b/tests/packagedcode/data/models/full-expected.json
index f254042951c..4ff66d07bef 100644
--- a/tests/packagedcode/data/models/full-expected.json
+++ b/tests/packagedcode/data/models/full-expected.json
@@ -35,6 +35,7 @@
   "bug_tracking_url": "http://homepage.com/issues",
   "code_view_url": "http://homepage.com/code",
   "vcs_url": "git+http://homepage.com/code.git@12ed302c4b4c2aa10638db3890",
+  "documentation_url": null,
   "copyright": "copyright (c) nexB Inc.",
   "holder": "nexB Inc.",
   "declared_license_expression": "apache-2.0",
diff --git a/tests/packagedcode/data/models/simple-expected.json b/tests/packagedcode/data/models/simple-expected.json
index 64432622056..2d7ccd90f07 100644
--- a/tests/packagedcode/data/models/simple-expected.json
+++ b/tests/packagedcode/data/models/simple-expected.json
@@ -31,6 +31,7 @@
   "bug_tracking_url": null,
   "code_view_url": null,
   "vcs_url": "git+https://somerepo.com/that.git",
+  "documentation_url": null,
   "copyright": null,
   "holder": null,
   "declared_license_expression": "apache-2.0",
diff --git a/tests/packagedcode/test_package_models.py b/tests/packagedcode/test_package_models.py
index 0370054324f..51d783db5db 100644
--- a/tests/packagedcode/test_package_models.py
+++ b/tests/packagedcode/test_package_models.py
@@ -53,6 +53,7 @@ def test_Package_creation_and_dump(self):
             ('bug_tracking_url', None),
             ('code_view_url', None),
             ('vcs_url', None),
+            ('documentation_url', None),
             ('copyright', None),
             ('holder', None),
             ('declared_license_expression', None),