diff --git a/doc/source/user_guide/boolean.rst b/doc/source/user_guide/boolean.rst
index 5276bc6142206..4f0ad0e8ceaeb 100644
--- a/doc/source/user_guide/boolean.rst
+++ b/doc/source/user_guide/boolean.rst
@@ -9,7 +9,7 @@
 .. _boolean:
 
 **************************
-Nullable Boolean Data Type
+Nullable Boolean data type
 **************************
 
 .. versionadded:: 1.0.0