diff --git a/Command-language.md b/Command-language.md
index 074e5e1..f756a3f 100644
--- a/Command-language.md
+++ b/Command-language.md
@@ -113,4 +113,8 @@ r is Angle a b is Sphere
 Angle a Sphere named b named r
 ```
 
-It seems like this should assign the identifier `r` to the angle between `a` and a new sphere with identifier `b`. Readability is very poor for both versions!
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+It seems like this should assign the identifier `r` to the angle between `a` and a new sphere with identifier `b`. Readability is very poor for both versions! Suggestions:
+- If the language has both statements and expressions, `is` could be a statement, and thus syntactically inadmissible for nesting.
+- If the language is purely expression-based:
+  - An `is` expression could return unit, making it semantically inadmissible for nesting.
+  - An `is` expression could require punctuation for nesting.
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