add missing punctuation

diff --git a/faq.mdwn b/faq.mdwn
index 2e7fa10a03424e80f43493122931f9c295e8c0b9..92a2ef6ba9ffd1cf1f66492ebb021771c1bf52e9 100644 (file)
--- a/faq.mdwn
+++ b/faq.mdwn
@@ -27,7 +27,7 @@ See [[excluding]].
 
 See help for `message-citation-line-format` for details.
 
-## What are sexp queries
+## What are sexp queries?
 
 For the syntax of sexp queries, see [the manual
 page](https://notmuchmail.org/doc/latest/man7/notmuch-sexp-queries.html).