diff --git a/README.md b/README.md
index 8263951..2f48244 100644
--- a/README.md
+++ b/README.md
@@ -63,4 +63,12 @@ network can select its boundary mode out of the following options:
 * `neumann`
 
 For higher dimensional problems, it is assumed that the mode is the same for all
-boundaries.
\ No newline at end of file
+boundaries.
+
+### Boundary condition
+
+All major modes of boundary conditions on physical fields are supported. Note
+however, how the boundary condition changes what is considered a degree of
+freedom
+
+![](img/three_boundary_conditions.svg)
\ No newline at end of file
diff --git a/img/three_boundary_conditions.svg b/img/three_boundary_conditions.svg
new file mode 100644
index 0000000..80b3102
--- /dev/null
+++ b/img/three_boundary_conditions.svg
@@ -0,0 +1,3 @@
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