diff --git a/doc/book/toolchain/info/retro-unu b/doc/book/toolchain/info/retro-unu
index 394d381..cf644d8 100644
--- a/doc/book/toolchain/info/retro-unu
+++ b/doc/book/toolchain/info/retro-unu
@@ -5,6 +5,9 @@ are in a format called Unu. This allows easy mixing of
 commentary and code blocks, making it simple to document
 the code.
 
+The Unu format does not support writing code and commentary "out
+of order".
+
 As an example,
 
     # Determine The Average Word Name Length
diff --git a/doc/book/toolchain/man/retro-unu b/doc/book/toolchain/man/retro-unu
index 2fe213d..d9c53c3 100644
--- a/doc/book/toolchain/man/retro-unu
+++ b/doc/book/toolchain/man/retro-unu
@@ -13,6 +13,9 @@ DESCRIPTION
      retro-unu is a tool for extracting code from fenced blocks in literate
      sources. It will write output to stdout.
 
+     retro-unu does not support "out of order" structuring of code, commentary,
+     and test blocks.
+
 AUTHORS
      Charles Childers <crc@forthworks.com>
 
diff --git a/man/retro-unu.1 b/man/retro-unu.1
index ce47272..6264067 100644
--- a/man/retro-unu.1
+++ b/man/retro-unu.1
@@ -19,6 +19,11 @@ write output to stdout.
 
 A code block starts with ~~~ on a line by itself and ends with
 a second ~~~. Test blocks start and end with ```.
+
+.Nm
+does not support "out of order" structuring of the code,
+commentary, and test blocks.
+
 .Sh OPTIONS
 .Bl -tag -width -indent
 .It Fl t