diff --git a/seq-diagram/README.md b/seq-diagram/README.md
new file mode 100644
index 0000000..c0fd53b
--- /dev/null
+++ b/seq-diagram/README.md
@@ -0,0 +1,7 @@
+To visualize this sequence diagram, go to
+https://www.websequencediagrams.com/
+
+and paste in the comments of the .src file
+
+![image](./seq-diagram.png)
+
diff --git a/seq-diagram/mme-seq-diagram.src b/seq-diagram/mme-seq-diagram.src
new file mode 100644
index 0000000..90294c4
--- /dev/null
+++ b/seq-diagram/mme-seq-diagram.src
@@ -0,0 +1,16 @@
+title Matchmaker sequence
+
+participant Ada
+participant Bob
+participant A
+participant B
+
+
+Bob->B : Submits metadata plus patient data
+Ada->A : Submits metadata plus patient data
+A->B: API Match Request
+note right of B: B performs match, eg top 10
+B->A: API returns list of scored patients plus metadata
+A->Ada: Displays matching patients plus contactinfo
+Ada->Bob : emails
+note right of Bob: Ada asks Bob for more info
diff --git a/seq-diagram/seq-diagram.png b/seq-diagram/seq-diagram.png
new file mode 100644
index 0000000..c231275
Binary files /dev/null and b/seq-diagram/seq-diagram.png differ