diff --git a/include/llvm/Analysis/LoopPass.h b/include/llvm/Analysis/LoopPass.h
index ef7c713..60ad0d9 100644
--- a/include/llvm/Analysis/LoopPass.h
+++ b/include/llvm/Analysis/LoopPass.h
@@ -68,7 +68,7 @@
   /// SimpleAnalysis - Provides simple interface to update analysis info
   /// maintained by various passes. Note, if required this interface can
   /// be extracted into a separate abstract class but it would require
-  /// additional use of multiple inheritance in Pass class hierarcy, something
+  /// additional use of multiple inheritance in Pass class hierarchy, something
   /// we are trying to avoid.
 
   /// Each loop pass can override these simple analysis hooks to update
@@ -134,7 +134,7 @@
   /// SimpleAnalysis - Provides simple interface to update analysis info
   /// maintained by various passes. Note, if required this interface can
   /// be extracted into a separate abstract class but it would require
-  /// additional use of multiple inheritance in Pass class hierarcy, something
+  /// additional use of multiple inheritance in Pass class hierarchy, something
   /// we are trying to avoid.
 
   /// cloneBasicBlockSimpleAnalysis - Invoke cloneBasicBlockAnalysis hook for
diff --git a/include/llvm/PassManagers.h b/include/llvm/PassManagers.h
index d376913..bac9626 100644
--- a/include/llvm/PassManagers.h
+++ b/include/llvm/PassManagers.h
@@ -28,8 +28,8 @@
 //
 // Pass Manager Infrastructure uses multiple pass managers.  They are
 // PassManager, FunctionPassManager, MPPassManager, FPPassManager, BBPassManager.
-// This class hierarcy uses multiple inheritance but pass managers do not derive
-// from another pass manager.
+// This class hierarchy uses multiple inheritance but pass managers do not
+// derive from another pass manager.
 //
 // PassManager and FunctionPassManager are two top-level pass manager that
 // represents the external interface of this entire pass manager infrastucture.
diff --git a/lib/Analysis/LoopPass.cpp b/lib/Analysis/LoopPass.cpp
index 4cbafab..460a1b0 100644
--- a/lib/Analysis/LoopPass.cpp
+++ b/lib/Analysis/LoopPass.cpp
@@ -32,7 +32,7 @@
   CurrentLoop = NULL;
 }
 
-/// Delete loop from the loop queue and loop hierarcy (LoopInfo). 
+/// Delete loop from the loop queue and loop hierarchy (LoopInfo). 
 void LPPassManager::deleteLoopFromQueue(Loop *L) {
 
   if (Loop *ParentLoop = L->getParentLoop()) { // Not a top-level loop.