useful tools for communicating software changes, planned or completed

pictures

• sequence diagrams
• entity relationship diagrams, i.e. data schemas
• data flow diagrams (boxes and arrows)

code

• code snippets
• pseudocode
• example diffs of pseudocode

text

• recipe steps (numbered lists w/ steps added/crossed out)
• structure with headings. make text easier to scan for key parts, and read non-linearly