diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09c2c67e..939e1727 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Removed
 
 ### Fixed
+- BBOX openapi yaml to only allow 4 or 6 element arrays
 
 ## Older versions
 
diff --git a/STAC-extensions.yaml b/STAC-extensions.yaml
index 7414098d..969b1158 100644
--- a/STAC-extensions.yaml
+++ b/STAC-extensions.yaml
@@ -527,8 +527,11 @@ components:
       required: false
       schema:
         type: array
-        minItems: 4
-        maxItems: 6
+        oneOf:
+          - minItems: 4
+            maxItems: 4
+          - minItems: 6
+            maxItems: 6
         items:
           type: number
       style: form
diff --git a/STAC.yaml b/STAC.yaml
index eced971b..13744521 100644
--- a/STAC.yaml
+++ b/STAC.yaml
@@ -283,8 +283,11 @@ components:
       required: false
       schema:
         type: array
-        minItems: 4
-        maxItems: 6
+        oneOf:
+          - minItems: 4
+            maxItems: 4
+          - minItems: 6
+            maxItems: 6
         items:
           type: number
       style: form
diff --git a/api-spec.md b/api-spec.md
index d41fd2ca..a42bf89a 100644
--- a/api-spec.md
+++ b/api-spec.md
@@ -185,11 +185,30 @@ to get to the next page without mirroring the entire query structure back to the
 
 Example requests can be found in the [examples document](./examples.md#paging).
 
-## Filter Parameters and Fields
+## Query Parameters and Fields
 
-Unless otherwise noted by **Path-only**, these filters are passed as query string parameters, form parameters, or JSON 
-entity fields.  For filters that represent a set of values, query and form parameters should use comma-separated 
-string values and JSON entity attributes should use JSON Arrays. 
+The following list of parameters is used to narrow search queries. Most all of them can be represented as
+query string parameters in a GET request, or as JSON entity fields in a POST request. One parameter,
+`collectionId` is designated as **Path-only**, which means it should only be used as a query string parameter.
+The `collections` parameter works similarly, but takes multiple collectionId's in an array, so it can be used
+with a single value array in JSON if the same functionality is desired. For filters that represent a set of values, 
+query parameters should use comma-separated string values (with no outer brackets \[ or \]) and JSON entity 
+attributes should use JSON Arrays. 
+
+### Examples
+
+```http
+GET /search?collections=landsat8,sentinel&bbox=-10.415,36.066,3.779,44.213&limit=200&datetime=2017-05-05T00:00:00Z
+```
+
+```json
+{
+    "collections": ["landsat8","sentinel"],
+    "bbox": [10.415,36.066,3.779,44.213],
+    "limit": 200,
+    "datetime": "2017-05-05T00:00:00Z"
+}
+```
 
 | Parameter    | Type             | APIs         | Description |
 | -----------  | ---------------- | ------------ | ----------- |
@@ -202,7 +221,7 @@ string values and JSON entity attributes should use JSON Arrays.
 | collections  | \[string]        | STAC         | Array of Collection IDs to include in the search for items. Only Items in one of the provided Collections will be searched |
 
 Only one of either **intersects** or **bbox** should be specified.  If both are specified, a 400 Bad Request response 
-should be returned. 
+should be returned. See [examples](examples.md) to see sample requests.
 
 ## Reserved Parameters
 
diff --git a/openapi/OAFeat.yaml b/openapi/OAFeat.yaml
index 4f1c2036..8fdb26d2 100644
--- a/openapi/OAFeat.yaml
+++ b/openapi/OAFeat.yaml
@@ -152,8 +152,11 @@ components:
       required: false
       schema:
         type: array
-        minItems: 4
-        maxItems: 6
+        oneOf:
+          - minItems: 4
+            maxItems: 4
+          - minItems: 6
+            maxItems: 6
         items:
           type: number
       style: form
diff --git a/openapi/STAC.yaml b/openapi/STAC.yaml
index d1d239d3..9e0e1132 100644
--- a/openapi/STAC.yaml
+++ b/openapi/STAC.yaml
@@ -137,8 +137,6 @@ components:
       explode: false
     # This schema extends OAFeat.yaml#/parameters/bbox.
     bbox:
-      name: bbox
-      in: query
       description: |-
         Only features that have a geometry that intersects the bounding box are selected.
         The bounding box is provided as four or six numbers, depending on
@@ -174,15 +172,6 @@ components:
         WGS 84 (from 160.6°E to 170°W and from 55.95°S to 25.89°S) would be
         represented in JSON as `[160.6, -55.95, -170, -25.89]` and in a query as
         `bbox=160.6,-55.95,-170,-25.89`.
-      required: false
-      schema:
-        type: array
-        minItems: 4
-        maxItems: 6
-        items:
-          type: number
-      style: form
-      explode: false
   responses:
     # This schema extends OAFeat.yaml#/components/responses/LandingPage.
     LandingPage: