Document iFrame without arguments.

c98ea2a5 · Robbert Krebbers · efc93d9c · c98ea2a5
Commit c98ea2a5 authored Aug 02, 2016 by Robbert Krebbers
--- a/ProofMode.md
+++ b/ProofMode.md
@@ -70,7 +70,9 @@ Elimination of logical connectives
 Separating logic specific tactics
 ---------------------------------

- `iFrame "H0 ... Hn"` : cancel the hypotheses `H0 ... Hn` in the goal. 
+- `iFrame "H0 ... Hn"` : cancel the hypotheses `H0 ... Hn` in the goal. When
+  `iFrame` is called without arguments, it attempts to frame all spatial
+  hypotheses.
 - `iCombine "H1" "H2" as "H"` : turns `H1 : P1` and `H2 : P2` into
  `H : P1 ★ P2`.