From 148f39275576d8cef7b23a162b07762e8503131a Mon Sep 17 00:00:00 2001
From: Marshall Lochbaum <mwlochbaum@gmail.com>
Date: Mon, 15 Mar 2021 17:02:06 -0400
Subject: Specify that system functions are optional

---
 docs/spec/system.html | 1 +
 1 file changed, 1 insertion(+)

(limited to 'docs/spec/system.html')

diff --git a/docs/spec/system.html b/docs/spec/system.html
index fead3b97..4a028f92 100644
--- a/docs/spec/system.html
+++ b/docs/spec/system.html
@@ -7,6 +7,7 @@
 <h1 id="specification-bqn-system-provided-values">Specification: BQN system-provided values</h1>
 <p>This portion of the spec is definitely still a draft.</p>
 <p>The <code><span class='Value'>•</span></code> symbol is used to access values other than primitives provided by BQN.</p>
+<p>All system values described in the BQN specification are optional: an implementation does not have to include any of them. However, if a system value with one of the names given below is included, then it must have the specified behavior.</p>
 <h2 id="scripts">Scripts</h2>
 <table>
 <thead>
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