diff --git a/clang/lib/Lex/PPExpressions.cpp b/clang/lib/Lex/PPExpressions.cpp
index d843182..b1ed0e1 100644
--- a/clang/lib/Lex/PPExpressions.cpp
+++ b/clang/lib/Lex/PPExpressions.cpp
@@ -363,7 +363,7 @@
       NumBits = TI.getChar16Width();
     else if (Literal.isUTF32())
       NumBits = TI.getChar32Width();
-    else
+    else // char or char8_t
       NumBits = TI.getCharWidth();
 
     // Set the width.