diff --git a/firmware/tunerstudio/rusefi.input b/firmware/tunerstudio/rusefi.input
index 7943df2bb9..a14bce4a2f 100644
--- a/firmware/tunerstudio/rusefi.input
+++ b/firmware/tunerstudio/rusefi.input
@@ -2278,6 +2278,7 @@ cmd_set_engine_type_default = "w\x00\x31\x00\x00"
panel = fsioSetting, East
dialog = fsioFormulas, "FSIO Formulas"
+ field = "!FSIO uses Reverse Polish Notation. Please read http://rusefi.com/s/fsio"
field = "#1", fsioFormulas1
field = "#2", fsioFormulas2
field = "#3", fsioFormulas3
diff --git a/misc/www/s/fsio/index.shtml b/misc/www/s/fsio/index.shtml
new file mode 100644
index 0000000000..d3ab64524c
--- /dev/null
+++ b/misc/www/s/fsio/index.shtml
@@ -0,0 +1,17 @@
+
+
+
+
+
+
+
+
+
+
+
+http://rusefi.com/wiki/index.php?title=Manual:Flexible_Logic
+
+
+
+
+