diff --git a/origin.go b/origin.go
index 3f2f0a7e..2edec477 100644
--- a/origin.go
+++ b/origin.go
@@ -33,7 +33,7 @@ func addOriginInMap(key, n *Node, file string) *Node {
 
 // addOrigin injects a compact __origin__ sequence into the mapping node n.
 //
-// Format: [file, key_name, key_line, key_col, nf, f1_name, f1_delta, f1_col, ..., ns, s1_name, s1_count, s1_l0_delta, s1_c0, ...]
+// Format: [file, key_name, key_line, key_col, nf, f1_name, f1_delta, f1_col, ..., ns, s1_name, s1_count, s1_l0_delta, s1_c0, ..., end_delta, end_col]
 //
 //   - file: source file path
 //   - key_name:  the YAML key whose value is this mapping
@@ -42,6 +42,10 @@ func addOriginInMap(key, n *Node, file string) *Node {
 //   - per field: name (string), line delta from key_line (int), column (int)
 //   - ns: number of sequence fields that have item locations
 //   - per sequence: name (string), item count (int), then count × (line delta, col)
+//   - end_delta, end_col: end of the whole mapping block — line delta from
+//     key_line and absolute column of the position just past its last content.
+//     Appended last so a consumer that stops after the sequences section
+//     simply ignores it (backward compatible).
 func addOrigin(key, n *Node, file string) *Node {
 	if isOrigin(key) {
 		return n
@@ -108,6 +112,16 @@ func buildOriginSeq(key, n *Node, file string) []*Node {
 	nodes = append(nodes, fieldNodes...)
 	nodes = append(nodes, intNode(ns))
 	nodes = append(nodes, seqNodes...)
+
+	// Block end: line delta from key_line and absolute end column of the whole
+	// mapping. Lets a consumer reconstruct the full block span
+	// [key_line, key_line+end_delta] -- e.g. an entire endpoint operation block.
+	endDelta, endCol := 0, 0
+	if n.EndLine > 0 {
+		endDelta = n.EndLine - key.Line
+		endCol = n.EndColumn
+	}
+	nodes = append(nodes, intNode(endDelta), intNode(endCol))
 	return nodes
 }
 
diff --git a/origin_test.go b/origin_test.go
index 124fbde5..4a4d4f0b 100644
--- a/origin_test.go
+++ b/origin_test.go
@@ -68,6 +68,8 @@ __origin__:
     - 0
     - 1
     - 0
+    - 3
+    - 17
 root:
     __origin__:
         - file.yaml
@@ -82,6 +84,8 @@ root:
         - 2
         - 5
         - 0
+        - 3
+        - 17
     hello: world
     object:
         __origin__:
@@ -94,6 +98,8 @@ root:
             - 1
             - 9
             - 0
+            - 1
+            - 17
         foo: bar
 `
 
@@ -132,6 +138,8 @@ __origin__:
     - 0
     - 1
     - 0
+    - 5
+    - 19
 root:
     __origin__:
         - file.yaml
@@ -143,6 +151,8 @@ root:
         - 1
         - 5
         - 0
+        - 5
+        - 19
     continents:
         - __origin__:
             - file.yaml
@@ -157,6 +167,8 @@ root:
             - 1
             - 11
             - 0
+            - 1
+            - 19
           name: europe
           size: 10
         - __origin__:
@@ -172,6 +184,8 @@ root:
             - 1
             - 11
             - 0
+            - 1
+            - 19
           name: america
           size: 20
 `
@@ -214,6 +228,8 @@ __origin__:
     - 0
     - 1
     - 0
+    - 5
+    - 23
 parent:
     __origin__:
         - spec.yaml
@@ -228,6 +244,8 @@ parent:
         - 2
         - 5
         - 0
+        - 5
+        - 23
     labels:
         __origin__:
             - spec.yaml
@@ -245,6 +263,8 @@ parent:
             - 3
             - 9
             - 0
+            - 3
+            - 23
         env: production
         region: us-east
         version: "2.0"
@@ -289,6 +309,8 @@ __origin__:
     - 0
     - 1
     - 0
+    - 5
+    - 18
 schema:
     __origin__:
         - spec.yaml
@@ -314,6 +336,8 @@ schema:
         - integer
         - 5
         - 11
+        - 5
+        - 18
     description: a test
     type:
         - string
@@ -471,6 +495,51 @@ alias: *schema
 	c.Assert(ns > 0, Equals, true, Commentf("alias __origin__ must record sequence item locations"))
 }
 
+// TestOrigin_BlockEnd verifies the trailing end_delta/end_col appended to each
+// __origin__ sequence reconstruct the end of the whole block (the position just
+// past its last content), which is how kin-openapi recovers an endpoint's span.
+func (s *S) TestOrigin_BlockEnd(c *C) {
+	// 1: paths:
+	// 2:   /pets:
+	// 3:     get:
+	// 4:       summary: list
+	// 5:       x: "y"
+	// 6:   /health:
+	input := `paths:
+  /pets:
+    get:
+      summary: list
+      x: "y"
+  /health:
+    get:
+      summary: ok
+`
+	dec := yaml.NewDecoder(bytes.NewBufferString(input))
+	dec.Origin(true, "spec.yaml")
+	var out any
+	err := dec.Decode(&out)
+	c.Assert(err, IsNil)
+
+	get := out.(map[string]any)["paths"].(map[string]any)["/pets"].(map[string]any)["get"].(map[string]any)
+	seq, ok := get["__origin__"].([]any)
+	c.Assert(ok, Equals, true, Commentf("get block must carry __origin__"))
+
+	keyLine := toAnyInt(seq[2]) // header: file, key_name, key_line, key_col, ...
+	c.Assert(keyLine, Equals, 3, Commentf("get key is on line 3"))
+
+	// end_delta, end_col are the last two entries.
+	endDelta := toAnyInt(seq[len(seq)-2])
+	endCol := toAnyInt(seq[len(seq)-1])
+	endLine := keyLine + endDelta
+	// When a block is followed by a dedented sibling, the end lands on the
+	// block's last content line (x: "y" on line 5), inclusive. The key property
+	// for block extraction: it covers the whole get block and does not bleed
+	// into the /health sibling on line 6.
+	c.Assert(endLine, Equals, 5, Commentf("get block should end at its last content line (5), not bleed into the sibling; got %d", endLine))
+	// End column is just past the last content (`x: "y"` ends at col 12, so 13).
+	c.Assert(endCol, Equals, 13, Commentf("end column should be just past the last content; got %d", endCol))
+}
+
 func (s *S) TestOrigin_DuplicateKey(c *C) {
 	input := `
 root: