diff --git a/src/unxt/_quantity/register_primitives.py b/src/unxt/_quantity/register_primitives.py
index f662441..5e3b636 100644
--- a/src/unxt/_quantity/register_primitives.py
+++ b/src/unxt/_quantity/register_primitives.py
@@ -3308,6 +3308,33 @@ def _sort_p_one_operand(
 
 @register(lax.sqrt_p)
 def _sqrt_p(x: AbstractQuantity) -> AbstractQuantity:
+    """Square root of a quantity.
+
+    Examples
+    --------
+    >>> import quaxed.numpy as qnp
+
+    >>> from unxt import UncheckedQuantity
+    >>> q = UncheckedQuantity(9, "m")
+    >>> qnp.sqrt(q)
+    UncheckedQuantity(Array(3, dtype=float32, ...), unit='m1/2')
+
+    >>> from unxt import Quantity
+    >>> q = Quantity(9, "m")
+    >>> qnp.sqrt(q)
+    Quantity['length'](Array(3, dtype=float32, ...), unit='m1/2')
+
+    >>> from unxt import Distance
+    >>> q = Distance(9, "m")
+    >>> qnp.sqrt(q)
+    Quantity['length'](Array(3, dtype=float32, ...), unit='m1/2')
+
+    >>> from unxt import Parallax
+    >>> q = Parallax(9, "mas")
+    >>> qnp.sqrt(q)
+    Quantity['angle'](Array(3, dtype=float32, ...), unit='mas1/2')
+
+    """
     # Promote the Quantity to something that supports sqrt units.
     # E.g. Distance -> Quantity
     x = promote(x)[0]