diff --git a/src/include/utils/guc.h b/src/include/utils/guc.h
index 1892c7927b..1126b34798 100644
--- a/src/include/utils/guc.h
+++ b/src/include/utils/guc.h
@@ -90,8 +90,7 @@ typedef enum
  * dividing line between "interactive" and "non-interactive" sources for
  * error reporting purposes.
  *
- * PGC_S_TEST is used when testing values to be used later ("doit" will always
- * be false, so this never gets stored as the actual source of any value).
+ * PGC_S_TEST is used when testing values to be used later.
  * For example, ALTER DATABASE/ROLE tests proposed per-database or per-user
  * defaults this way, and CREATE FUNCTION tests proposed function SET clauses
  * this way.  This is an interactive case, but it needs its own source value