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-rw-r--r--toys/pending/expr.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/toys/pending/expr.c b/toys/pending/expr.c
index c7da4d1c..936f5fbd 100644
--- a/toys/pending/expr.c
+++ b/toys/pending/expr.c
@@ -3,6 +3,9 @@
* Copyright 2013 Daniel Verkamp <daniel@drv.nu>
*
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/expr.html
+ *
+ * The web standard is incomplete (precedence grouping missing), see:
+ * http://permalink.gmane.org/gmane.comp.standards.posix.austin.general/10141
USE_EXPR(NEWTOY(expr, NULL, TOYFLAG_USR|TOYFLAG_BIN))