Typo

required/firstaid/latex2e-first-aid-for-external-files.dtx

@@ -406,7 +406,7 @@
 %
 % \subsection{The \pkg{babel} package}
 %
-% Because of the switch from what was already an odd structure to an \pk{ltcmd}
+% Because of the switch from what was already an odd structure to an \pkg{ltcmd}
 % expandable command, we have to save-and-restore an internal function to undo
 % a patch.
 %    \begin{macrocode}