diff --git a/doc/src/Eqs/fix_ti_spring_force.jpg b/doc/src/Eqs/fix_ti_spring_force.jpg
index 347102b3e7..584535a1bc 100644
Binary files a/doc/src/Eqs/fix_ti_spring_force.jpg and b/doc/src/Eqs/fix_ti_spring_force.jpg differ
diff --git a/doc/src/Eqs/fix_ti_spring_force.tex b/doc/src/Eqs/fix_ti_spring_force.tex
index 0acd0e54ae..356f7d3ccc 100644
--- a/doc/src/Eqs/fix_ti_spring_force.tex
+++ b/doc/src/Eqs/fix_ti_spring_force.tex
@@ -5,7 +5,7 @@
 \begin{document}
 
 $$
-  F_{\text{total}} = \left( 1-\lambda \right) F_{\text{solid}} + \lambda F_{\text{harm}}
+  F = \left( 1-\lambda \right) F_{\text{solid}} + \lambda F_{\text{harm}}
 $$
 
 \end{document}
diff --git a/doc/src/Eqs/fix_ti_spring_function_1.jpg b/doc/src/Eqs/fix_ti_spring_function_1.jpg
index 8d3c9a78e3..ef2698f34b 100644
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diff --git a/doc/src/Eqs/fix_ti_spring_function_2.jpg b/doc/src/Eqs/fix_ti_spring_function_2.jpg
index 96a17e63e6..6f12b90c78 100644
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