diff --git a/src/pages/sta/virtual_work.astro b/src/pages/sta/virtual_work.astro
index ce76d0c2..12e5e4cb 100644
--- a/src/pages/sta/virtual_work.astro
+++ b/src/pages/sta/virtual_work.astro
@@ -32,7 +32,7 @@ import Col from "../../components/Col.astro"
 
 <!-- Lectures 34 and 35 -->
 
-<p>In general, a force does work when it produces a displacement along its line of action. When we talk about virtual work, we're imagining those displacements becoming infinitesimally small. </p>
+<p>This page covers systems of connected rigid bodies with 1 degree of freedom (DOF). That is, the system's entire configuration can be described using one independent coordinate, oftentimes a single angle, <InlineEquation equation = "\\theta."/> In general, a force does work when it produces a displacement along its line of action. When we talk about virtual work, we're imagining those displacements becoming infinitesimally small. </p>
 
 <p> Work is defined as <strong>positive</strong> when the force and the displacement are in the same direction, and <strong>negative</strong> when the force and displacement are in opposite directions. </p>