Add a bit more context to changelog entries

CHANGELOG.md

@@ -34,9 +34,11 @@ Changelog
 -   Strength two symmetrization was not correctly producing orthogonal arrays due to erroneous
     truncation, which has been fixed (@kylegulshen, gh-990).
 -   The `STORE` instruction now accepts `int` or `float` in addition to `MemoryReference` as it's
-    `source` argument (@appleby, gh-999).
+    `source` argument. As a result, you can now `STORE` an immediate value into a memory register
+    (@appleby, gh-999).
 -   The `EQ`, `LT`, `LE`, `GT`, and `GE` instructions now all accept `float` in addition to `int` or
-    `MemoryReference` as their third and final argument (@appleby, gh-999).
+    `MemoryReference` as their third and final argument. As a result, you can now perform classical
+    comparisons against an immediate `float` value (@appleby, gh-999).
 
 [v2.11](https://github.com/rigetti/pyquil/compare/v2.10.0...v2.11.0) (September 3, 2019)
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