diff --git a/datafusion/functions/src/math/signum.rs b/datafusion/functions/src/math/signum.rs
index 05b78fcffe2a7..21b38988c0a01 100644
--- a/datafusion/functions/src/math/signum.rs
+++ b/datafusion/functions/src/math/signum.rs
@@ -34,7 +34,8 @@ use datafusion_macros::user_doc;
     doc_section(label = "Math Functions"),
     description = r#"Returns the sign of a number.
 Negative numbers return `-1`.
-Zero and positive numbers return `1`."#,
+Zero returns `0`.
+Positive numbers return `1`."#,
     syntax_example = "signum(numeric_expression)",
     standard_argument(name = "numeric_expression", prefix = "Numeric"),
     sql_example = r#"```sql
diff --git a/docs/source/user-guide/sql/scalar_functions.md b/docs/source/user-guide/sql/scalar_functions.md
index 1bfec4ce43599..644d42935ec29 100644
--- a/docs/source/user-guide/sql/scalar_functions.md
+++ b/docs/source/user-guide/sql/scalar_functions.md
@@ -796,7 +796,8 @@ round(numeric_expression[, decimal_places])
 
 Returns the sign of a number.
 Negative numbers return `-1`.
-Zero and positive numbers return `1`.
+Zero returns `0`.
+Positive numbers return `1`.
 
 ```sql
 signum(numeric_expression)