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-rw-r--r--runtime/doc/diagnostic.txt5
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diff --git a/runtime/doc/diagnostic.txt b/runtime/doc/diagnostic.txt
index 53046b399f..a2bacebc72 100644
--- a/runtime/doc/diagnostic.txt
+++ b/runtime/doc/diagnostic.txt
@@ -365,6 +365,11 @@ config({opts}, {namespace}) *vim.diagnostic.config()*
the beginning of the virtual text.
• prefix: (string) Prepend diagnostic message with
prefix.
+ • suffix: (string or function) Append diagnostic
+ message with suffix. If a function, it must have the
+ signature (diagnostic) -> string, where {diagnostic}
+ is of type |diagnostic-structure|. This can be used
+ to render an LSP diagnostic error code.
• format: (function) A function that takes a diagnostic
as input and returns a string. The return value is
the text used to display the diagnostic. Example: >