diff --git a/com.oracle.truffle.r.library/src/com/oracle/truffle/r/library/methods/Slot.java b/com.oracle.truffle.r.library/src/com/oracle/truffle/r/library/methods/Slot.java
index 201f0d7d149f0946c17019e73cdccd860f6f9cc5..03eb4418b5467abf60e79721eda6931383cef8da 100644
--- a/com.oracle.truffle.r.library/src/com/oracle/truffle/r/library/methods/Slot.java
+++ b/com.oracle.truffle.r.library/src/com/oracle/truffle/r/library/methods/Slot.java
@@ -25,7 +25,7 @@ import com.oracle.truffle.r.runtime.RError;
 import com.oracle.truffle.r.runtime.Utils;
 import com.oracle.truffle.r.runtime.data.model.RAbstractStringVector;
 
-// Transcribed from src/library/methods/slot.c
+// Transcribed from src/library/methods/src/slot.c
 
 public class Slot {
 
diff --git a/com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/StandardGeneric.java b/com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/StandardGeneric.java
index 08c9e57b8c1930c4216ba587f5665ef4a229bbc6..2a590e3749181816039b058a24c41352711c8f37 100644
--- a/com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/StandardGeneric.java
+++ b/com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/StandardGeneric.java
@@ -53,7 +53,8 @@ import com.oracle.truffle.r.runtime.data.RNull;
 import com.oracle.truffle.r.runtime.data.RStringVector;
 import com.oracle.truffle.r.runtime.env.REnvironment;
 
-// transcribed from src/main/objects.c
+// transcribed from /src/library/methods/src/methods_list_dispatch.c (R_dispatch_generic function)
+
 @RBuiltin(name = "standardGeneric", visibility = CUSTOM, kind = PRIMITIVE, parameterNames = {"f", "fdef"}, behavior = COMPLEX)
 public abstract class StandardGeneric extends RBuiltinNode {
 
diff --git a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/AccessSlotNode.java b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/AccessSlotNode.java
index 50b84824a122ebfa9b012e38dfe7807e58e57518..e5307e12f2b19f3d435dc30d25e7b497556d3231 100644
--- a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/AccessSlotNode.java
+++ b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/AccessSlotNode.java
@@ -21,7 +21,6 @@ import com.oracle.truffle.api.dsl.Specialization;
 import com.oracle.truffle.api.profiles.BranchProfile;
 import com.oracle.truffle.r.nodes.RASTUtils;
 import com.oracle.truffle.r.nodes.attributes.GetAttributeNode;
-import com.oracle.truffle.r.nodes.attributes.GetFixedAttributeNode;
 import com.oracle.truffle.r.nodes.attributes.InitAttributesNode;
 import com.oracle.truffle.r.nodes.function.ClassHierarchyNode;
 import com.oracle.truffle.r.nodes.function.ClassHierarchyNodeGen;
@@ -42,6 +41,8 @@ import com.oracle.truffle.r.runtime.data.model.RAbstractVector;
 import com.oracle.truffle.r.runtime.env.REnvironment;
 import com.oracle.truffle.r.runtime.nodes.RNode;
 
+// Transcribed from src/main/attrib.c file (R_do_slot function)
+
 /**
  * Perform a slot access. This node represents the {@code @} operator in R.
  */
diff --git a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/UpdateSlotNode.java b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/UpdateSlotNode.java
index c0b37f806041ee648bfecb8dccf76df73f04f3ec..22972c305937af31631bec8b43d876dadfb1b80f 100644
--- a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/UpdateSlotNode.java
+++ b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/UpdateSlotNode.java
@@ -18,7 +18,6 @@ import com.oracle.truffle.api.dsl.NodeChild;
 import com.oracle.truffle.api.dsl.NodeChildren;
 import com.oracle.truffle.api.dsl.Specialization;
 import com.oracle.truffle.r.nodes.RASTUtils;
-import com.oracle.truffle.r.nodes.attributes.SetFixedAttributeNode;
 import com.oracle.truffle.r.nodes.attributes.InitAttributesNode;
 import com.oracle.truffle.r.nodes.attributes.SetAttributeNode;
 import com.oracle.truffle.r.runtime.RCaller;
@@ -31,6 +30,8 @@ import com.oracle.truffle.r.runtime.data.RNull;
 import com.oracle.truffle.r.runtime.env.REnvironment;
 import com.oracle.truffle.r.runtime.nodes.RNode;
 
+// Transcribed from src/main/attrib.c file (R_do_slot_assign function)
+
 @NodeChildren({@NodeChild(value = "object", type = RNode.class), @NodeChild(value = "name", type = RNode.class), @NodeChild(value = "value", type = RNode.class)})
 public abstract class UpdateSlotNode extends RNode {
 
diff --git a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/CollectGenericArgumentsNode.java b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/CollectGenericArgumentsNode.java
index 9c9ffffb388f84c5819887d65e8721dc07ed7048..3acb958ef9701fc0229a07e17fafe3d69a94c9f3 100644
--- a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/CollectGenericArgumentsNode.java
+++ b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/CollectGenericArgumentsNode.java
@@ -45,6 +45,8 @@ import com.oracle.truffle.r.runtime.data.RStringVector;
 import com.oracle.truffle.r.runtime.data.RSymbol;
 import com.oracle.truffle.r.runtime.nodes.RBaseNode;
 
+// transcribed from /src/library/methods/src/methods_list_dispatch.c (R_dispatch_generic function)
+
 /*
  * Used to collect arguments of the generic function for S4 method dispatch. Modeled after {@link CollectArgumentsNode}.
  */
diff --git a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/DispatchGeneric.java b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/DispatchGeneric.java
index 733648fbaea8f503607b1b735e07275a000315ab..ea03075c9a6fe23cf2c4ba80440876339b94c4c8 100644
--- a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/DispatchGeneric.java
+++ b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/DispatchGeneric.java
@@ -30,6 +30,7 @@ import com.oracle.truffle.r.runtime.data.RStringVector;
 import com.oracle.truffle.r.runtime.env.REnvironment;
 import com.oracle.truffle.r.runtime.nodes.RBaseNode;
 
+// transcribed from /src/library/methods/src/methods_list_dispatch.c (R_dispatch_generic function)
 public abstract class DispatchGeneric extends RBaseNode {
 
     public abstract Object executeObject(VirtualFrame frame, REnvironment mtable, RStringVector classes, RFunction fdef, String fname);
diff --git a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/GetPrimName.java b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/GetPrimName.java
index 1e450fd0305ce0255954e667cf2816950dfce822..84229b57ef0d5313013909ec59ce9d622496bc0c 100644
--- a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/GetPrimName.java
+++ b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/GetPrimName.java
@@ -17,7 +17,7 @@ import com.oracle.truffle.r.nodes.builtin.RExternalBuiltinNode;
 import com.oracle.truffle.r.runtime.RError;
 import com.oracle.truffle.r.runtime.data.RFunction;
 
-// transcribed from src/library/methods/utils.c
+// transcribed from src/library/methods/src/utils.c
 public abstract class GetPrimName extends RExternalBuiltinNode.Arg1 {
 
     @Specialization(guards = "f.isBuiltin()")
diff --git a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/LoadMethod.java b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/LoadMethod.java
index 71ae3eef2b2593978101505c6d1e786b381b4e53..4be981a574ff0db8c4c8bfb736f99a60452b1748 100644
--- a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/LoadMethod.java
+++ b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/objects/LoadMethod.java
@@ -39,6 +39,7 @@ import com.oracle.truffle.r.runtime.env.REnvironment;
 import com.oracle.truffle.r.runtime.nodes.RBaseNode;
 import com.oracle.truffle.r.runtime.nodes.RSyntaxNode;
 
+// transcribed from /src/library/methods/src/methods_list_dispatch.c (R_loadMethod function)
 abstract class LoadMethod extends RBaseNode {
 
     private static final ArgumentsSignature SIGNATURE = ArgumentsSignature.get("method", "fname", "envir");