diff --git a/cfg/CFG.h b/cfg/CFG.h
index 72fa0a674..a9d4c310f 100644
--- a/cfg/CFG.h
+++ b/cfg/CFG.h
@@ -50,9 +50,11 @@ class BlockExit final {
 /// for different parts of the RHS.
 class Binding final {
 public:
+    /// LHS for a single "assignment" in the CFG.
     VariableUseSite bind;
+    /// Location for the full "assignment" (use bind.loc if you need the location for the LHS only).
     core::LocOffsets loc;
-
+    /// RHS for a single "assignment" in the CFG.
     InstructionPtr value;
 
     Binding(LocalOccurrence bind, core::LocOffsets loc, InstructionPtr value);
diff --git a/cfg/Instructions.h b/cfg/Instructions.h
index 55be75407..ad22e2926 100644
--- a/cfg/Instructions.h
+++ b/cfg/Instructions.h
@@ -31,6 +31,7 @@ class VariableUseSite final {
 public:
     LocalRef variable;
     core::TypePtr type;
+    /// Location for the LHS of an "assignment" in the CFG.
     core::LocOffsets loc;
     VariableUseSite() = default;
     VariableUseSite(LocalRef local) : variable(local){};