diff --git a/docs/source/algorithms/SaveReflectometryAscii-v1.rst b/docs/source/algorithms/SaveReflectometryAscii-v1.rst
index e3409a6f1f724c87c9f93b7cc4d2631b435df277..5f93582cab7d4ab34c655f43905902e6f3559349 100644
--- a/docs/source/algorithms/SaveReflectometryAscii-v1.rst
+++ b/docs/source/algorithms/SaveReflectometryAscii-v1.rst
@@ -106,7 +106,7 @@ Usage
    Theta 1 + dir + ref numbers : Not defined
    Theta 2 + dir + ref numbers : Not defined
    Theta 3 + dir + ref numbers : Not defined
-   d : 0.29999999999999999
+   d : 0.29999999999999999 mm
    Parameter  : Not defined
    Parameter  : Not defined
    Parameter  : Not defined