diff --git a/docs/src/statecharts/statechart1.txt b/docs/src/statecharts/statechart1.txt
deleted file mode 100644
index a551ef9..0000000
--- a/docs/src/statecharts/statechart1.txt
+++ /dev/null
@@ -1,19 +0,0 @@
-+----------------------------------------------------------------+
-|                              SM                                |
-+----------------------------------------------------------------+
-|                                                                |
-|         +----------------+          +----------------+         |
-|     *-->|     LOCKED     |          |    UNLOCKED    |         |
-|         +----------------+          +----------------+         |
-|     +---| entry/         |          | entry/         |---+     |
-|     |   | exit/          |          | exit/          |   |     |
-|     |   |                |          |                |   |     |
-| PUSH|   |                |---COIN-->|                |   |COIN |
-|     |   |                |          |                |   |     |
-|     |   |                |          |                |   |     |
-|     |   |                |<--PUSH---|                |   |     |
-|     +-->|                |          |                |<--+     |
-|         |                |          |                |         |
-|         +----------------+          +----------------+         |
-|                                                                |
-+----------------------------------------------------------------+