diff --git a/fmmd_data_model/fmmd_data_model.tex b/fmmd_data_model/fmmd_data_model.tex
index b82eee7..4bd0d08 100644
--- a/fmmd_data_model/fmmd_data_model.tex
+++ b/fmmd_data_model/fmmd_data_model.tex
@@ -177,9 +177,9 @@ We must check this against all components used.
 For our example, we component `K' which has an extra 
 failure mode for degraded performance `d'. Thus applying the function $fm$ 
 to component type `K' under these temperature range conditions
-gives the following failure modes, $fm{K} =\{ K^0_a, K^0_b, K^0_d \}$.
+gives the following failure modes, $fm(K) =\{ K^0_a, K^0_b, K^0_d \}$.
 Were our system specified for a ${{0}\oc}$ to ${{80}\oc}$  range
-we could say $fm{K} =\{ K^0_a, K^0_b \}$.
+we could say $fm(K) =\{ K^0_a, K^0_b \}$.
 
 \pagebreak[3]
 \paragraph{Get the failure modes from the functional groups.}