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-rw-r--r--scm/define-music-properties.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/scm/define-music-properties.scm b/scm/define-music-properties.scm
index 4df3f93340..f8c567d1fa 100644
--- a/scm/define-music-properties.scm
+++ b/scm/define-music-properties.scm
@@ -183,7 +183,7 @@ If zero, signals a beat containing varying durations.")
Options are @code{'text} and @code{'hairpin}.")
(span-text ,markup? "The displayed text for dynamic text
spanners (e.g., cresc.)")
- (spanner-id ,string? "Identifier to distinguish concurrent spanners.")
+ (spanner-id ,key? "Identifier to distinguish concurrent spanners.")
(start-callback ,procedure? "Function to compute the negative length
of starting grace notes. This property can only be defined as initializer
in @file{scm/@/define-music-types.scm}.")