Index: clang/include/clang/Basic/AttrDocs.td
===================================================================
--- clang/include/clang/Basic/AttrDocs.td
+++ clang/include/clang/Basic/AttrDocs.td
@@ -1963,8 +1963,9 @@
 likelihood. The positive likelihood is the more likely of path of execution
 than the neutral likelihood.
 
-These attributes have no effect on the generated code when using
-PGO (Profile-Guided Optimization) or at optimization level 0.
+These attributes have no effect on the generated code when there is PGO
+(Profile-Guided Optimization) data available for the statements, or at
+optimization level 0.
 
 In Clang, the attributes will be ignored if they're not placed on
 * the ``case`` or ``default`` label of a ``switch`` statement,