diff --git a/README.md b/README.md
index d123007..3943214 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,9 @@ as the files 0*.pdf. We now need to convert these to machine-readable
 assembly code, write tools such as an assembler, a filesystem creation tool,
 and write from scratch missing things like a shell, ls etc.
 
+The code in the original scans are (c) Novel who own the rights to the Unix
+source code. Everything that didn't come from the scanned pages are GPLv3.
+
 scans	  holds the unmodified OCR versions of the scanned files
 
 src/cmd   holds the modified source code of the user-mode programs
diff --git a/scans/Readme b/scans/Readme
index 98904ef..667a8bc 100644
--- a/scans/Readme
+++ b/scans/Readme
@@ -2,6 +2,9 @@ This area contains the OCR'd versions of the PDP-7 scans that are at
 http://www.tuhs.org/Archive/PDP-11/Distributions/research/McIlroy_v0/0*.pdf
 The files should be unaltered versions of the scanned pages.
 
+Novel owns the rights to the Unix source code, so these files are probably
+(c) 1970 Novel. They are certainly not under the GPLv3 license.
+
 For modified versions of these files, look in src/cmds and src/sys.
 
 Details of the files:
diff --git a/src/cmd/cat.s b/src/cmd/cat.s
index 39b6a87..9a5e65e 100644
--- a/src/cmd/cat.s
+++ b/src/cmd/cat.s
@@ -58,7 +58,7 @@ nofiles:
 
 done:
    lac noc
-   sns
+   sna
      sys exit
    and d1
    sna cla