---
desc: The named delta between two Sirno Lake states.
lifecycle: Active
name: Ripple
structural:
  category:
  - concept
  belongs:
  - sirno-lake
  refines:
  - versioning
---

A *ripple* is the named delta between the frostline and the waterline.
The frostline is the latest Sirno Frost snapshot.
The waterline is the current public *lake*.

A *ripple* exists when an *entry* differs between those two states.
The difference may be a changed name, description, prose body, or structural field.
Added and deleted *entries* are ripples too.
Generated footer regions are ignored,
because Sirno Frost stores canonical metadata and prose rather than rendered navigation.

The term fits the *lake* model.
A *lake* is the readable body of project knowledge.
A *ripple* is a visible disturbance in that body:
small enough to inspect locally,
but meaningful because it belongs to a larger surface.

The *ripple* names reviewable difference, not semantic judgment.
Sirno can show what changed and which configured neighbors must be reviewed.
It does not decide whether the new design is correct.

A *ripple* produces a *wave* of *tide workitems* through configured structural edge policies.
The *tide* is the active worklist created from all current ripples.
