diff --git a/manual/syntax_ref.tex b/manual/syntax_ref.tex
index 1bf876a7a08f9ec3c2ac7271ec4373cad12b00e2..ded6a35b46a15e901ea466c1f46a2d0fc8d70d92 100644
--- a/manual/syntax_ref.tex
+++ b/manual/syntax_ref.tex
@@ -1023,7 +1023,7 @@ attr
 usage : {\tt\small attr component M value Rc[x/y] value x/ybeta value gx/y value}\\
 \begin{tabular}{ccp{10cm}}
 component &=  &  the component for the attributes to be set to\\
- M &=  & mass in grammes \\
+ M &=  & mass in Kilogrames \\
  Rc&=  & radius of curvature, in metres (zero is used for plane surface)\\
  Rcx&=  & radius of curvature in interferometer plane\\
  Rcy&=  & radius of curvature in plane perpendicular to interferometer\\