diff --git a/source/back.tex b/source/back.tex
index f94ef43f35..62a5fd5d98 100644
--- a/source/back.tex
+++ b/source/back.tex
@@ -86,6 +86,10 @@
   Roldan Pozo, Karin Remington, R. Client Whaley
   \doccite{An Updated Set of Basic Linear Algebra Subprograms (BLAS)}.
   ACM Trans.\ Math.\ Soft., Vol.\ 28, Issue 2, 2002.
+\bibitem{flynn-taxonomy}
+  Michael J.\ Flynn,
+  \doccite{Very High-Speed Computing Systems}.
+  Proceedings of the IEEE, Vol.\ 54, Issue 12, 1966.
 \end{thebibliography}
 
 % FIXME: For unknown reasons, hanging paragraphs are not indented within our
diff --git a/source/numerics.tex b/source/numerics.tex
index a549ae5924..1cdc5bb0ce 100644
--- a/source/numerics.tex
+++ b/source/numerics.tex
@@ -16088,6 +16088,8 @@
 The intent is to support acceleration through data-parallel execution resources
 where available, such as SIMD registers and instructions or execution units
 driven by a common instruction decoder.
+SIMD stands for ``Single Instruction Stream -- Multiple Data Stream'';
+it is defined in Flynn 1966\supercite{flynn-taxonomy}.
 \end{note}
 
 \pnum