diff --git a/llvm/include/llvm/Analysis/ScalarEvolution.h b/llvm/include/llvm/Analysis/ScalarEvolution.h
index 56dc8f8eeaec..d3a8d8f4fe51 100644
--- a/llvm/include/llvm/Analysis/ScalarEvolution.h
+++ b/llvm/include/llvm/Analysis/ScalarEvolution.h
@@ -651,7 +651,9 @@ namespace llvm {
                           const SCEV *LHS, const SCEV *RHS);
 
     /// SimplifyICmpOperands - Simplify LHS and RHS in a comparison with
-    /// predicate Pred. Return true iff any changes were made.
+    /// predicate Pred. Return true iff any changes were made. If the
+    /// operands are provably equal or inequal, LHS and RHS are set to
+    /// the same value and Pred is set to either ICMP_EQ or ICMP_NE.
     ///
     bool SimplifyICmpOperands(ICmpInst::Predicate &Pred,
                               const SCEV *&LHS,