There have been a couple of recent fixes to the ARM courses. Here’s a summary (with reporter in brackets):

• Introduction to ARM > Registers
  • The ‘aliases’ diagram was wrong: corrected. (Felix Dreissig)
• Efficient C for ARM > Sentinels
  • The ‘pipelined’ Wikipedia link was broken. (Marek Niepiekło, Matt Godbolt)

In fact, while fixing the aliases diagram I re-drew all of the Introduction to ARM diagrams in Affinity Designer.