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diff --git a/coq/README b/coq/README
index 97ea8ec8..dc0bd3bc 100644
--- a/coq/README
+++ b/coq/README
@@ -46,20 +46,22 @@ Grammar for x-symbols:
connectives /\, \/, etc. See the X-Symbol char table for details.
a symbol is encoded only if
- - preceded by _ or some space or some symbol
+ - preceded by _ or ' or some space or some symbol
**and**
- - followed by _ or some space or some symbol
+ - followed by _ or ' or some space or some symbol
Grammar for sub/superscript:
- a double _ introduces a subscript that ends at the first space
- a double ^ introduces a superscript that ends at the first space
- - a _ followed by { introduces a subscript
- expression that ends at the first }
- - a ^ followed by { introduces a superscript
- expression that ends at the first }
+ - a , followed by { introduces a subscript expression that ends at
+ the first } (_{...} was not possible due to coq notation mechanism)
+ - a ^ followed by { introduces a superscript expression that ends
+ at the first }
+
+ See example-x-symbols.v in this directory for examples.
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