Austin's 30-yarder five minutes before half-time - his eighth goal of the season - gave promotion-chasing Rangers another narrow win.
Their success this term has been built on a rock-solid defence and boss Harry Redknapp is keen for them to improve at the other end of the pitch.
"It was tight today and it didn't need to be," said Bond.
"We could have scored more goals and we hit the bar, but we'll happily take that and it's another clean sheet for us.
"It was a great goal from Charlie and he deserved that, because when he's not scored he's worked really hard and I think the fans appreciate that.
"Harry's teams have never been purposefully built on defence. They've been built on flair and letting people play and he still wants that.
"But this situation has evolved. It does put pressure on the defence but as long as you keep your concentration you can keep clean sheets."
Rangers marked Redknapp's 30 years in management by producing a special-edition matchday programme and the spotlight has been on the former Tottenham boss this week.
But he declined to speak to the media after the game and Bond explained: "He doesn't like the focus on that sort of thing.
"It's obviously a fantastic achievement for him but typically of Harry he didn't want all that.
"He's very grateful that people remind him of it and help him celebrate it, but his only focus is on the team and thankfully it was a good day all round."
Charlton manager Chris Powell, meanwhile, felt his struggling team were unfortunate not to pick up a point.
The defeat left the Addicks one place above the relegation zone and Powell conceded: "We were beaten by a wonder strike - an excellent goal.
"I felt we settled into the game against a team with a good manager who has got some good players at his disposal.
"We acquitted ourselves well but lacked belief in the final third. We defended really well but certain things didn't go our way and that's hard to take.
"Sometimes you just can't stop quality and Charlie's goal really was a great strike. That's what you pay for.
"I've got to do my best to instil some confidence in the players. They know what they're up against but they're in the same league and I feel can play against these guys.
"You've got to say to yourself 'Can we match that? Can we play against that?' And we can.
"We're in the lower reaches but we've got two big home games coming up and on another day we could have got something from this one."