Doc: clarify the syntax of the "begin <section>"

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index f9a8efa982615c95177757c94e00bddb6b9f4507..9bee9e874b0cd32b268e8abffc4789f326c8dfd8 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -4800,8 +4800,8 @@ help with this. See the comments in &_src/EDITME_& for details.
 Exim's configuration file is divided into a number of different parts. General
 option settings must always appear at the start of the file. The other parts
 are all optional, and may appear in any order. Each part other than the first
-is introduced by the word &"begin"& followed by the name of the part. The
-optional parts are:
+is introduced by the word &"begin"& followed by at least one literal
+space, and the name of the part. The optional parts are:
 
 .ilist
 &'ACL'&: Access control lists for controlling incoming SMTP mail (see chapter