diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed6f709..84ef3d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,11 @@
 
 ## Unreleased
 
+* BREAKING: Changed collection configuration format to nest `path` within `inputs`
+  * Allows multiple inputs to merge into one collection
+  * Add ability to put each input under a sub key
+  * Allows fixed metadata to be attacked to each input
+
 ## v0.2.1 (May 2, 2024)
 
 * Flatlake now looks into symlinks when finding content
diff --git a/docs/content/docs/_index.md b/docs/content/docs/_index.md
index 9499f88..79f17f2 100644
--- a/docs/content/docs/_index.md
+++ b/docs/content/docs/_index.md
@@ -58,9 +58,11 @@ A simple configuration to start with for the above folder structure is:
 ```yml
 collections:
   - output_key: "posts"
-    path: "collections/posts"
+    inputs:
+      - path: "collections/posts"
   - output_key: "people"
-    path: "collections/authors"
+    inputs:
+      - path: "collections/authors"
 ```
 
 This denotes our `posts` and `authors` folders as collections, each output under the same name in our final API.  
diff --git a/docs/content/docs/collections.md b/docs/content/docs/collections.md
index cb0eca2..55e887a 100644
--- a/docs/content/docs/collections.md
+++ b/docs/content/docs/collections.md
@@ -15,60 +15,79 @@ Collections are how files are grouped in Flatlake. Each collection specifies:
 `flatlake.yml`:
 ```yml
 collections:
-  - path: "collections/posts"
-    output_key: "posts"
-  - path: "collections/authors"
-    output_key: "people"
+  - output_key: "posts"
+    inputs:
+      - path: "collections/posts"
+  - output_key: "people"
+    inputs:
+      - path: "collections/authors"
 ```
 
 ## Options
 
-Each collection requires a `path` and an `output_key` to be defined.
+Each collection requires an `output_key`, and at least one `inputs` entry containing a `path`.
 
-### Path
+### Input > Path
 
-The path from the global `source` to this collection.
+A path from the global `source` to add to this collection.
 
-Files within this collection will be treated relative to this path.  
+Files within this collection input will be treated relative to this path.  
 In the below example, a file at `<source>/collections/posts/post-a.md` will be output at `<dest>/posts/post-a.json`.
 
 {{< diffcode >}}
 ```yml
 collections:
-+  - path: "collections/posts"
-    output_key: "posts"
+  - output_key: "posts"
+    inputs:
++      - path: "collections/posts"
 ```
 {{< /diffcode >}}
 
-### Output key
+### Input > Glob
 
-The folder to use when writing single and list files for this collection.
+The glob expression Flatlake should use when finding files within this collection. Defaults to `**/*.{md}` to select all markdown files in any directory.
 
-In the below example, a file at `<source>/collections/posts/post-a.md` will be output at `<dest>/files/post-a.json`,
-and list files for this collection will be available at `<dest>/files/all/page-1.json`.
+{{< diffcode >}}
+```yml
+collections:
+  - output_key: "posts"
+    inputs:
+      - path: "collections/posts"
++        glob: "**/*.{md}"
+```
+{{< /diffcode >}}
+
+### Input > Meta
+
+Fixed metadata that should be added to each collection item sourced from this input.
 
 {{< diffcode >}}
 ```yml
 collections:
-  - path: "collections/posts"
-+    output_key: "files"
+  - output_key: "posts"
+    inputs:
+      - path: "collections/posts"
++        meta:
++           source: "collections"
++           url: https://example.com
 ```
 {{< /diffcode >}}
 
-### Glob
+### Output key
 
-The glob expression Flatlake should use when finding files within this collection. Defaults to `**/*.{md}` to select all markdown files in any directory.
+The folder to use when writing single and list files for this collection.
+
+In the below example, a file at `<source>/collections/posts/post-a.md` will be output at `<dest>/files/post-a.json`,
+and list files for this collection will be available at `<dest>/files/all/page-1.json`.
 
 {{< diffcode >}}
 ```yml
 collections:
   - path: "collections/posts"
-    output_key: "posts"
-+    glob: "**/*.{md}"
++    output_key: "files"
 ```
 {{< /diffcode >}}
 
-
 ### Page size
 
 The page size to use when writing paginated endpoints within this collection.