diff --git a/docs/source/index.rst b/docs/source/index.rst
index fff0bfd..3fb460f 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -12,6 +12,7 @@
 
    operations.rst
    onu-state-machine.rst
+   olt-state-machine.rst
    development-dependencies.rst
    bbr.rst
    bbsimctl.rst
diff --git a/docs/source/olt-state-machine.rst b/docs/source/olt-state-machine.rst
new file mode 100644
index 0000000..d92d6f8
--- /dev/null
+++ b/docs/source/olt-state-machine.rst
@@ -0,0 +1,42 @@
+.. _OLT State Machine:
+
+OLT State Machine
+=================
+
+In ``BBSim`` the device state is created using a state machine
+library: `fsm <https://github.com/looplab/fsm>`__.
+
+Here is a list of possible states for an OLT in BBSim:
+
+.. list-table:: OLT States
+    :header-rows: 1
+
+    * -
+      - Initialized
+      - Enabled
+      - Disabled
+      - Deleted
+    * - Data model is created for OLT, NNIs, PONs and ONUs
+      - Starts the listener on the NNI interface and the DHCP server,
+        Starts the OLT gRPC server,
+        Moves the ONUs to ``initialized`` state
+      - Sends OLT, NNIs and PONs ``UP`` indications
+        Transition the ONUs into ``discovered`` state
+      - Transition the ONUs into ``disabled`` state
+        Sends OLT, NNIs and PONs ``UP`` indications
+      - Stops the OLT gRPC Server
+
+Below is a diagram of the state machine allowed transitions:
+
+.. graphviz::
+
+    digraph {
+        rankdir=TB
+        newrank=true
+        graph [pad="1,1" bgcolor="#cccccc"]
+        node [style=filled]
+
+        created -> initialized -> enabled -> disabled -> deleted
+        disabled -> enabled
+        deleted -> initialized
+    }
\ No newline at end of file
diff --git a/docs/source/onu-state-machine.rst b/docs/source/onu-state-machine.rst
index 38d60ef..3af8f5a 100644
--- a/docs/source/onu-state-machine.rst
+++ b/docs/source/onu-state-machine.rst
@@ -6,7 +6,7 @@
 In ``BBSim`` the device state is created using a state machine
 library: `fsm <https://github.com/looplab/fsm>`__.
 
-Here is a list of possible state transitions in BBSim:
+Here is a list of possible state transitions for an ONU in BBSim:
 
 .. list-table:: ONU States
     :widths: 10 35 10 45