From 0b17bcece9c062d9cc010ff995d5fa0d02c0adbf Mon Sep 17 00:00:00 2001
From: Mark Wooding <mdw@distorted.org.uk>
Date: Fri, 14 May 2021 21:48:54 +0100
Subject: [PATCH] lib.c (subst): Finish the half-baked comment explaining
 `delimtab'.

---
 lib.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib.c b/lib.c
index eb2a586..a73f0d0 100644
--- a/lib.c
+++ b/lib.c
@@ -1379,7 +1379,11 @@ static const char *subst(const char *p, const char *l,
   size_t n;
 
   /* It would be best if we could process literal text at high speed.  To
-   * this end,
+   * this end, we have a table, indexed by the low-order bits of F, to tell
+   * us which special characters we need to stop at.  This way, we can use
+   * `strcspn' to skip over literal text and stop at the next character which
+   * needs special handling.  Entries in this table with a null pointer
+   * correspond to impossible flag settings.
    */
   static const char *const delimtab[] = {
 
-- 
2.11.0