diff --git a/docs/source/format/CanonicalExtensions.rst b/docs/source/format/CanonicalExtensions.rst
index b2e464e7c5eea..d76602188c165 100644
--- a/docs/source/format/CanonicalExtensions.rst
+++ b/docs/source/format/CanonicalExtensions.rst
@@ -284,7 +284,7 @@ UUID
    UUIDs as FixedSizeBinary(16) with big-endian notation and does not interpret the bytes in any way.
 
 8-bit Boolean
-====
+=============
 
 Bool8 represents a boolean value using 1 byte (8 bits) to store each value instead of only 1 bit as in
 the native Arrow Boolean type. Although less compact that the native representation, Bool8 may have