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-rw-r--r--docs/LangRef.html3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html
index 575f81ee07..59dacf7ef4 100644
--- a/docs/LangRef.html
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@@ -850,7 +850,8 @@ reference to another object, which must live in memory.</p>
of elements. Packed types are used when multiple primitive data
are operated in parallel using a single instruction (SIMD).
A packed type requires a size (number of
-elements) and an underlying primitive data type. Packed types are
+elements) and an underlying primitive data type. Vectors must have a power
+of two length (1, 2, 4, 8, 16 ...). Packed types are
considered <a href="#t_firstclass">first class</a>.</p>
<h5>Syntax:</h5>