From cdc2edfaa24ab3c4636f2d8857f4d0b86bc2602c Mon Sep 17 00:00:00 2001
From: Ginner <26798615+Ginner@users.noreply.github.com>
Date: Tue, 27 Jul 2021 08:58:07 +0200
Subject: [PATCH] Clearfication of substitution functions

I've tried expanding on the function substitution by supplying the predefined function as an example. Initially the example replaced the 'Pre-defined functions' section. However, I think this should remain.
---
 doc/wiki.txt | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/doc/wiki.txt b/doc/wiki.txt
index f89fd2f7..960d4eab 100644
--- a/doc/wiki.txt
+++ b/doc/wiki.txt
@@ -1260,6 +1260,17 @@ two rules that allow dynamic templates:
 The first rule is applied first, which allows the arguments in Rule 2 to be
 variable substitutions.
 
+Function substitution:
+The following predefined function serves as an example substitution-function.
+Here the varialbe `ctx` denotes the context dictionary from 
+|wiki-templates-context| as the first argument and 'text' is the text-string 
+supplied in the template. The shown function applies title-casing to 'text' 
+and returns it as a string. >
+
+  function! wiki#template#case_title(ctx, text) abort
+    return join(map(split(a:text), {_, x -> toupper(x[0]) . strpart(x, 1)}))
+  endfunction
+
 Pre-defined functions:~
   `wiki#template#case_title(ctx, string)`