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-rw-r--r--doc/ref/api-languages.texi2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/ref/api-languages.texi b/doc/ref/api-languages.texi
index dd4f223df..839e6eae2 100644
--- a/doc/ref/api-languages.texi
+++ b/doc/ref/api-languages.texi
@@ -138,7 +138,7 @@ only one bit, and so a test for, for example, @code{#f}-or-@code{nil}
may be made very efficiently. See @code{libguile/boolean.h}, for more
information.
-@subsubsection Equality
+@subsubheading Equality
Since Scheme's @code{equal?} must be transitive, and @code{'()}
is not @code{equal?} to @code{#f}, to Scheme @code{nil} is not