be more precise

Author: vladak

intro.tex

@@ -1969,7 +1969,7 @@
 (in Bourne-like shells via an internal command \texttt{export \emph{variable}}).
 After you export a variable, you do not need to export it again after its value
 is changed.  The command \texttt{env} prints current enviroment variables.
-You can also add a variable to the environment of an executed program without
+You can also add/change an environment variable of an executed program without
 changing the environment of your current shell:
 
 \begin{verbatim}