diff --git a/docs/LangRef.html b/docs/LangRef.html
index 20436ede7e2..33afe7e7e3b 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -1779,6 +1779,12 @@ specifying the number of bytes to copy, and the fourth argument is the alignment
 of the source and destination locations.
 </p>
 
+<p>
+If the call to this intrinisic has an alignment value that is not 0 or 1, then
+the caller guarantees that the size of the copy is a multiple of the alignment
+and that both the source and destination pointers are aligned to that boundary.
+</p>
+
 <h5>Semantics:</h5>
 
 <p>
@@ -1826,6 +1832,12 @@ specifying the number of bytes to copy, and the fourth argument is the alignment
 of the source and destination locations.
 </p>
 
+<p>
+If the call to this intrinisic has an alignment value that is not 0 or 1, then
+the caller guarantees that the size of the copy is a multiple of the alignment
+and that both the source and destination pointers are aligned to that boundary.
+</p>
+
 <h5>Semantics:</h5>
 
 <p>