diff --git a/src/transform3d.rs b/src/transform3d.rs
index 92b814a..1489cac 100644
--- a/src/transform3d.rs
+++ b/src/transform3d.rs
@@ -431,7 +431,7 @@ where
     /// 1   0   0   0
     /// 0   1   0   0
     /// 0   0   1 -1/d
-    /// 0   0   0   1
+    /// 0   0   0   0
     /// ```
     pub fn perspective(d: T) -> Self
     where
@@ -444,7 +444,7 @@ where
             _1(), _0(), _0(),  _0(),
             _0(), _1(), _0(),  _0(),
             _0(), _0(), _1(), -_1() / d,
-            _0(), _0(), _0(),  _1(),
+            _0(), _0(), _0(),  _0(),
         )
     }
 }