diff --git a/docs/WritingAnLLVMBackend.rst b/docs/WritingAnLLVMBackend.rst
index 73381b54517..85d0de11e82 100644
--- a/docs/WritingAnLLVMBackend.rst
+++ b/docs/WritingAnLLVMBackend.rst
@@ -952,6 +952,11 @@ XXXInstrInfo.h:
     int16_t getNamedOperandIdx(uint16_t Opcode, uint16_t NamedIndex);
   } // End namespace XXX
 
+Instruction itineraries can be queried using MCDesc::getSchedClass(). The
+value can be named by an enum generated by TableGen in XXXGenInstrInfo.inc.
+The name of the schedule classes are the same as provided in XXXSchedule.td plus
+a default NoIntinerary class.
+
 Instruction Relation Mapping
 ----------------------------
 
diff --git a/utils/TableGen/InstrInfoEmitter.cpp b/utils/TableGen/InstrInfoEmitter.cpp
index c8304de7b16..b3fa08f852e 100644
--- a/utils/TableGen/InstrInfoEmitter.cpp
+++ b/utils/TableGen/InstrInfoEmitter.cpp
@@ -545,6 +545,13 @@ void InstrInfoEmitter::emitEnums(raw_ostream &OS) {
        << "\t= " << i << ",\n";
   }
   OS << "    INSTRUCTION_LIST_END = " << NumberedInstructions.size() << "\n";
+  OS << "  };\n";
+  OS << "  enum {\n";
+  for (unsigned i = 0, e = SchedModels.numInstrSchedClasses(); i != e; ++i) {
+    OS << "    " << SchedModels.getSchedClass(i).Name
+       << "\t= " << i << ",\n";
+  }
+  OS << "    SCHED_LIST_END = " << SchedModels.numInstrSchedClasses() << "\n";
   OS << "  };\n}\n";
   OS << "} // End llvm namespace \n";