diff --git a/include/llvm/Analysis/DataStructure.h b/include/llvm/Analysis/DataStructure.h
index ab140bac874..9659c6074a8 100644
--- a/include/llvm/Analysis/DataStructure.h
+++ b/include/llvm/Analysis/DataStructure.h
@@ -62,7 +62,7 @@ public:
 
 // BUDataStructures - The analysis that computes the interprocedurally closed
 // data structure graphs for all of the functions in the program.  This pass
-// only performs a "Bottom Up" propogation (hence the name).
+// only performs a "Bottom Up" propagation (hence the name).
 //
 class BUDataStructures : public Pass {
   // DSInfo, one graph for each function
diff --git a/include/llvm/Analysis/DataStructure/DataStructure.h b/include/llvm/Analysis/DataStructure/DataStructure.h
index ab140bac874..9659c6074a8 100644
--- a/include/llvm/Analysis/DataStructure/DataStructure.h
+++ b/include/llvm/Analysis/DataStructure/DataStructure.h
@@ -62,7 +62,7 @@ public:
 
 // BUDataStructures - The analysis that computes the interprocedurally closed
 // data structure graphs for all of the functions in the program.  This pass
-// only performs a "Bottom Up" propogation (hence the name).
+// only performs a "Bottom Up" propagation (hence the name).
 //
 class BUDataStructures : public Pass {
   // DSInfo, one graph for each function
diff --git a/include/llvm/Analysis/IntervalPartition.h b/include/llvm/Analysis/IntervalPartition.h
index 44e730c42b9..508f00589bc 100644
--- a/include/llvm/Analysis/IntervalPartition.h
+++ b/include/llvm/Analysis/IntervalPartition.h
@@ -89,7 +89,7 @@ private:
 
   // updatePredecessors - Interval generation only sets the successor fields of
   // the interval data structures.  After interval generation is complete,
-  // run through all of the intervals and propogate successor info as
+  // run through all of the intervals and propagate successor info as
   // predecessor info.
   //
   void updatePredecessors(Interval *Int);