diff --git a/lib/Analysis/BasicConstraintManager.cpp b/lib/Analysis/BasicConstraintManager.cpp
index 6f62c4b..7bed393 100644
--- a/lib/Analysis/BasicConstraintManager.cpp
+++ b/lib/Analysis/BasicConstraintManager.cpp
@@ -448,6 +448,8 @@
   return T ? **T == V : false;
 }
 
+/// Scan all symbols referenced by the constraints. If the symbol is not alive
+/// as marked in LSymbols, mark it as dead in DSymbols.
 const GRState* BasicConstraintManager::RemoveDeadBindings(const GRState* St,
                                         StoreManager::LiveSymbolsTy& LSymbols,
                                         StoreManager::DeadSymbolsTy& DSymbols) {