diff --git a/include/clang/Sema/Sema.h b/include/clang/Sema/Sema.h
index 79b617cc57..1aaa9a36b8 100644
--- a/include/clang/Sema/Sema.h
+++ b/include/clang/Sema/Sema.h
@@ -2207,8 +2207,6 @@ public:
 
   /// CheckProtocolMethodDefs - This routine checks unimplemented
   /// methods declared in protocol, and those referenced by it.
-  /// \param IDecl - Used for checking for methods which may have been
-  /// inherited.
   void CheckProtocolMethodDefs(SourceLocation ImpLoc,
                                ObjCProtocolDecl *PDecl,
                                bool& IncompleteImpl,
diff --git a/lib/Sema/SemaLookup.cpp b/lib/Sema/SemaLookup.cpp
index 2206bd0b78..827cfbcfff 100644
--- a/lib/Sema/SemaLookup.cpp
+++ b/lib/Sema/SemaLookup.cpp
@@ -1100,15 +1100,12 @@ static NamedDecl *getVisibleDecl(NamedDecl *D) {
 /// begin. If the lookup criteria permits, name lookup may also search
 /// in the parent scopes.
 ///
-/// @param Name     The name of the entity that we are searching for.
+/// @param [in,out] R Specifies the lookup to perform (e.g., the name to
+/// look up and the lookup kind), and is updated with the results of lookup
+/// including zero or more declarations and possibly additional information
+/// used to diagnose ambiguities.
 ///
-/// @param Loc      If provided, the source location where we're performing
-/// name lookup. At present, this is only used to produce diagnostics when
-/// C library functions (like "malloc") are implicitly declared.
-///
-/// @returns The result of name lookup, which includes zero or more
-/// declarations and possibly additional information used to diagnose
-/// ambiguities.
+/// @returns \c true if lookup succeeded and false otherwise.
 bool Sema::LookupName(LookupResult &R, Scope *S, bool AllowBuiltinCreation) {
   DeclarationName Name = R.getLookupName();
   if (!Name) return false;
diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index 53ebbd49f5..973a2fe065 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -9838,7 +9838,7 @@ static bool IsOverloaded(const UnresolvedSetImpl &Functions) {
 /// set should not contain any member functions; those will be added
 /// by CreateOverloadedUnaryOp().
 ///
-/// \param input The input argument.
+/// \param Input The input argument.
 ExprResult
 Sema::CreateOverloadedUnaryOp(SourceLocation OpLoc, unsigned OpcIn,
                               const UnresolvedSetImpl &Fns,