diff --git a/tok/hnsw/heap.go b/tok/hnsw/heap.go
index da165f835ae..fee786dd607 100644
--- a/tok/hnsw/heap.go
+++ b/tok/hnsw/heap.go
@@ -1,3 +1,21 @@
+/*
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
+ */
+
 package hnsw
 
 import (
diff --git a/tok/hnsw/helper.go b/tok/hnsw/helper.go
index 9e15636f3b8..6111e05f355 100644
--- a/tok/hnsw/helper.go
+++ b/tok/hnsw/helper.go
@@ -1,3 +1,21 @@
+/*
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
+ */
+
 package hnsw
 
 import (
@@ -535,33 +553,33 @@ func (ph *persistentHNSW[T]) distance_betw(ctx context.Context, tc *TxnCache, in
 	return d
 }
 
-type CustomHeap struct {
+type HeapDataHolder struct {
 	data    []uint64
 	compare func(a, b uint64) bool
 }
 
 // Len is the number of elements in the collection.
-func (h CustomHeap) Len() int {
+func (h HeapDataHolder) Len() int {
 	return len(h.data)
 }
 
 // Less reports whether the element with index i should sort before the element with index j.
-func (h CustomHeap) Less(i, j int) bool {
+func (h HeapDataHolder) Less(i, j int) bool {
 	return h.compare(h.data[i], h.data[j])
 }
 
 // Swap swaps the elements with indexes i and j.
-func (h CustomHeap) Swap(i, j int) {
+func (h HeapDataHolder) Swap(i, j int) {
 	h.data[i], h.data[j] = h.data[j], h.data[i]
 }
 
 // Push adds an element to the heap.
-func (h *CustomHeap) Push(x interface{}) {
+func (h *HeapDataHolder) Push(x interface{}) {
 	h.data = append(h.data, x.(uint64))
 }
 
 // Pop removes and returns the maximum element from the heap.
-func (h *CustomHeap) Pop() interface{} {
+func (h *HeapDataHolder) Pop() interface{} {
 	old := h.data
 	n := len(old)
 	x := old[n-1]
@@ -608,7 +626,7 @@ func (ph *persistentHNSW[T]) addNeighbors(ctx context.Context, tc *TxnCache,
 			if err != nil {
 				log.Printf("[ERROR] While getting vector %s", err)
 			} else {
-				h := &CustomHeap{
+				h := &HeapDataHolder{
 					data: allLayerEdges[level],
 					compare: func(i, j uint64) bool {
 						return ph.distance_betw(ctx, tc, uuid, i, &inVec, &outVec) >
diff --git a/tok/hnsw/persistent_factory.go b/tok/hnsw/persistent_factory.go
index d391744195e..2b353e1a25b 100644
--- a/tok/hnsw/persistent_factory.go
+++ b/tok/hnsw/persistent_factory.go
@@ -1,3 +1,21 @@
+/*
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
+ */
+
 package hnsw
 
 import (
diff --git a/tok/hnsw/persistent_hnsw.go b/tok/hnsw/persistent_hnsw.go
index 00b55552e04..f6a33585bd4 100644
--- a/tok/hnsw/persistent_hnsw.go
+++ b/tok/hnsw/persistent_hnsw.go
@@ -1,3 +1,21 @@
+/*
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
+ */
+
 package hnsw
 
 import (
diff --git a/tok/hnsw/persistent_hnsw_test.go b/tok/hnsw/persistent_hnsw_test.go
index 2befa742030..11adcbea90e 100644
--- a/tok/hnsw/persistent_hnsw_test.go
+++ b/tok/hnsw/persistent_hnsw_test.go
@@ -1,3 +1,21 @@
+/*
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
+ */
+
 package hnsw
 
 import (
diff --git a/tok/hnsw/search_layer.go b/tok/hnsw/search_layer.go
index d01a864d063..2e39472dcc6 100644
--- a/tok/hnsw/search_layer.go
+++ b/tok/hnsw/search_layer.go
@@ -1,3 +1,21 @@
+/*
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
+ */
+
 package hnsw
 
 import (
diff --git a/tok/hnsw/test_helper.go b/tok/hnsw/test_helper.go
index 29f1412254a..69f851e659e 100644
--- a/tok/hnsw/test_helper.go
+++ b/tok/hnsw/test_helper.go
@@ -1,3 +1,21 @@
+/*
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
+ */
+
 package hnsw
 
 import (
diff --git a/tok/index/helper.go b/tok/index/helper.go
index de56ac5023d..2d08897c18b 100644
--- a/tok/index/helper.go
+++ b/tok/index/helper.go
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 Dgraph Labs, Inc. and Contributors
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -12,6 +12,8 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
  */
 
 package index
diff --git a/tok/index/helper_test.go b/tok/index/helper_test.go
index 1968ae8d4d3..0dc0ab1a7b3 100644
--- a/tok/index/helper_test.go
+++ b/tok/index/helper_test.go
@@ -12,6 +12,8 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
  */
 
 package index
diff --git a/tok/index/index.go b/tok/index/index.go
index 9d51b37ad55..e5c46894ba2 100644
--- a/tok/index/index.go
+++ b/tok/index/index.go
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 Dgraph Labs, Inc. and Contributors
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -12,6 +12,8 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ *
+ * Co-authored by: jai@hypermode.com, sunil@hypermode.com, bill@hypdermode.com
  */
 
 package index
diff --git a/tok/index/search_path.go b/tok/index/search_path.go
index b95f2e5a8e7..761971d9d98 100644
--- a/tok/index/search_path.go
+++ b/tok/index/search_path.go
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 Dgraph Labs, Inc. and Contributors
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -12,6 +12,8 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
  */
 
 package index
diff --git a/tok/index/types.go b/tok/index/types.go
index a9bac545b43..254b292ed8d 100644
--- a/tok/index/types.go
+++ b/tok/index/types.go
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 Dgraph Labs, Inc. and Contributors
+ * Copyright 2016-2024 Dgraph Labs, Inc. and Contributors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -12,6 +12,8 @@
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
+ *
+ * Co-authored by: jairad26@gmail.com, sunil@hypermode.com, bill@hypdermode.com
  */
 
 package index