diff --git a/docs/08_babylin_internals.md b/docs/08_babylin_internals.md
index 9955291..728b028 100644
--- a/docs/08_babylin_internals.md
+++ b/docs/08_babylin_internals.md
@@ -25,7 +25,7 @@ sequenceDiagram
   A->>BL: BLC_openPort(port0)
   A->>BL: BLC_loadSDF(handle, sdf_path, 1)
   A->>BL: BLC_getChannelHandle(handle, channelIndex)
-  A->>BL: BLC_sendCommand(channel, "start schedule N;")
+  A->>BL: BLC_sendCommand(channel, 'start schedule N;')
   A-->>T: connected
 ```