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-rw-r--r--lisp/progmodes/compile.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index 5faa21d75a2..da2a3ee9d65 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -331,7 +331,8 @@ beginning of line's indentation.
FILE can also have the form (FILE FORMAT...), where the FORMATs
\(e.g. \"%s.c\") will be applied in turn to the recognized file
name, until a file of that name is found. Or FILE can also be a
-function to return the filename.
+function that returns (FILENAME) or (RELATIVE-FILENAME . DIRNAME).
+In the former case, FILENAME may be relative or absolute.
LINE can also be of the form (LINE . END-LINE) meaning a range
of lines. COLUMN can also be of the form (COLUMN . END-COLUMN)