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-rw-r--r--doc/doc-docbook/spec.xfpt5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 1921a29e4..e9aa9cdfe 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -7349,6 +7349,11 @@ dot-separated components; a key such as &`*fict.example`&
in a database file is useless, because the asterisk in a partial matching
subject key is always followed by a dot.
+When the lookup is done from a string-expansion,
+the variables &$1$& and &$2$& contain the wild and non-wild parts of the key
+during the expansion of the replacement text.
+They return to their previous values at the end of the lookup item.
+