Packed elements must be a power of two in size

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24266 91177308-0d34-0410-b5e6-96231b3b80d8

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--- 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>