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-rw-r--r--lispref/minibuf.texi8
1 files changed, 5 insertions, 3 deletions
diff --git a/lispref/minibuf.texi b/lispref/minibuf.texi
index 1b076c5837d..3ac750d76a1 100644
--- a/lispref/minibuf.texi
+++ b/lispref/minibuf.texi
@@ -841,9 +841,11 @@ Methods}) and the setting of @code{enable-multibyte-characters}
(@pxref{Text Representations}) from whichever buffer was current before
entering the minibuffer.
-Completion ignores case when comparing the input against the possible
-matches, if the built-in variable @code{completion-ignore-case} is
-non-@code{nil}. @xref{Basic Completion}.
+If the built-in variable @code{completion-ignore-case} is
+non-@code{nil}, completion ignores case when comparing the input
+against the possible matches. @xref{Basic Completion}. In this mode
+of operation, @var{predicate} must also ignore case, or you will get
+surprising results.
Here's an example of using @code{completing-read}: