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diff --git a/spec/grammar.md b/spec/grammar.md
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+++ b/spec/grammar.md
@@ -38,6 +38,7 @@ Functions can be formed by fully applying operators or as trains. Operators are
| Derv
Fork = Func
| Operand Func Fork ⍝ 3-train
+ | nothing Func Fork ⍝ 2-train
Train = Fork
| Func Fork ⍝ 2-train
FuncExpr = Train