Clarify that `symbol-file' only works for symbols in Lisp files

* lisp/subr.el (symbol-file): Mention help-C-file-name in the doc
string (bug#14932).

diff --git a/lisp/subr.el b/lisp/subr.el
index 78507a552c18c35c518c1a649f82d4199676f075..88740159b934d0ea42b278870f26a6e27efefcfd 100644 (file)
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -2476,7 +2476,11 @@ file name without extension.
 If TYPE is nil, then any kind of definition is acceptable.  If
 TYPE is `defun', `defvar', or `defface', that specifies function
 definition, variable definition, or face definition only.
-Otherwise TYPE is assumed to be a symbol property."
+Otherwise TYPE is assumed to be a symbol property.
+
+This function only works for symbols defined in Lisp files.  For
+symbols that are defined in C files, use `help-C-file-name'
+instead."
   (if (and (or (null type) (eq type 'defun))
           (symbolp symbol)
           (autoloadp (symbol-function symbol)))