diff --git a/flang/documentation/ParserCombinators.md b/flang/documentation/ParserCombinators.md
index a6c8d150d8a2..d8031d8bb427 100644
--- a/flang/documentation/ParserCombinators.md
+++ b/flang/documentation/ParserCombinators.md
@@ -88,7 +88,9 @@ They are `constexpr`, so they should be viewed as type-safe macros.
    or with a warning if nonstandard usage warnings are enabled.
 * `deprecated(p)` parses p if strict standard compliance is disabled,
   with a warning if deprecated usage warnings are enabled.
-* `inContext(msg, p)` runs p within an error message context.
+* `inContext(msg, p)` runs p within an error message context; any
+  message that `p` generates will be tagged with `msg` as its
+  context.  Contexts may nest.
 * `withMessage(msg, p)` succeeds if `p` does, and if it does not,
   it discards the messages from `p` and fails with the specified message.
 * `recovery(p, q)` is equivalent to `p || q`, except that error messages