Additional info about restoring programs

docs/restoring_programs.md

@@ -31,3 +31,54 @@ contains space-separated list of additional programs to restore.
 
         set -g @resurrect-processes ':all:'
 
+### Clarifications
+
+> I don't understand tilde `~`, what is it and why is it used when restoring
+  programs?
+
+Let's say you use `rails server` command often. You want `tmux-resurrect` to
+save and restore it automatically. You might try adding `rails server` to the
+list of programs that will be restored:
+
+    set -g @resurrect-processes '"rails server"'  # will NOT work
+
+Upon save, `rails server` command will actually be saved as this command:
+`/Users/user/.rbenv/versions/2.0.0-p481/bin/ruby script/rails server`
+(if you wanna see how is any command saved, check it yourself in
+`~/.tmux/resurrect/last` file).
+
+When programs are restored, the `rails server` command will NOT be restored
+because it does not **strictly** match the long
+`/Users/user/.rbenv/versions/2.0.0-p481/bin/ruby script/rails server` string.
+
+The tilde `~` at the start of the string relaxes process name matching.
+
+    set -g @resurrect-processes '"~rails server"'  # OK
+
+The above option says: "restore full process if `rails server` string is found
+ANYWHERE in the process name".
+
+If you check long process string, there is in fact a `rails server` string at
+the end, so now the process will be successfully restored.
+
+> What is arrow `->` and why is is used?
+
+(Please read the above clarification about tilde `~`).
+
+Continuing with our `rails server` example, when the process is finally restored
+correctly it might not look pretty as you'll see the whole
+`/Users/user/.rbenv/versions/2.0.0-p481/bin/ruby script/rails server` string in
+the command line.
+
+Naturally, you'd rather want to see just `rails server` (what you initially
+typed), but that information is now unfortunately lost.
+
+To aid this, you can use arrow `->`:
+
+    set -g @resurrect-processes '"~rails server->rails server"'  # OK
+
+This option says: "when this process is restored use `rails server` as the
+command name".
+
+Full (long) process name is now ignored and you'll see just `rails server` in
+the command line when the program is restored.