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-rw-r--r--lispref/variables.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/lispref/variables.texi b/lispref/variables.texi
index dbc922a8bd8..c3bd61541d8 100644
--- a/lispref/variables.texi
+++ b/lispref/variables.texi
@@ -484,7 +484,8 @@ Here is an equivalent expression for the @code{defvar} special form:
(progn
(if (not (boundp '@var{symbol}))
(setq @var{symbol} @var{value}))
- (put '@var{symbol} 'variable-documentation '@var{doc-string})
+ (if '@var{doc-string}
+ (put '@var{symbol} 'variable-documentation '@var{doc-string}))
'@var{symbol})
@end group
@end example