diff --git a/llvm/lib/CodeGen/MachineModuleInfo.cpp b/llvm/lib/CodeGen/MachineModuleInfo.cpp
index 2bd13c0f97e1..a673d177fa1e 100644
--- a/llvm/lib/CodeGen/MachineModuleInfo.cpp
+++ b/llvm/lib/CodeGen/MachineModuleInfo.cpp
@@ -277,7 +277,7 @@ Function *MachineModuleInfo::getPersonality() const {
 }
 
 /// getPersonalityIndex - Return unique index for current personality
-/// function. NULL personality function should always get zero index.
+/// function. NULL/first personality function should always get zero index.
 unsigned MachineModuleInfo::getPersonalityIndex() const {
   const Function* Personality = NULL;
 
@@ -293,8 +293,8 @@ unsigned MachineModuleInfo::getPersonalityIndex() const {
       return i;
   }
 
-  // This should never happen
-  llvm_unreachable("Personality function should be set!");
+  // This will happen if the current personality function is
+  // in the zero index.
   return 0;
 }