diff --git a/llvm/lib/Transforms/IPO/IROutliner.cpp b/llvm/lib/Transforms/IPO/IROutliner.cpp
--- a/llvm/lib/Transforms/IPO/IROutliner.cpp
+++ b/llvm/lib/Transforms/IPO/IROutliner.cpp
@@ -1559,7 +1559,7 @@
 /// \p PN in.
 /// \param OutputMappings [in] - The mapping of output values from outlined
 /// region to their original values.
-/// \param UsedPhis [in, out] - The PHINodes in the block that have already been
+/// \param UsedPHIs [in, out] - The PHINodes in the block that have already been
 /// matched.
 /// \return the newly found or created PHINode in \p OverallPhiBlock.
 static PHINode*