diff --git a/.gitignore b/.gitignore
index 889eacd..53455e4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 /*
 
 # Dirs
+!/docs
 !/exl
 !/include
 !/src
diff --git a/docs/grammar.ebnf b/docs/grammar.ebnf
new file mode 100644
index 0000000..7d2d23e
--- /dev/null
+++ b/docs/grammar.ebnf
@@ -0,0 +1,6 @@
+program       := statement*
+statement     := expression
+expression    := call | string_literal
+call          := name "(" argument-list? ")"
+argument-list := string_literal ("," string_literal)*
+