Every trading journal records the trades you took. Almost none record the trades you didn't — the setups you passed on, the impulses you resisted, the sessions you sat out. But those are real decisions with real consequences, and journaling your no-trades sharpens your judgment and reinforces your discipline in ways a trade-only log can't.
Two kinds of no-trade worth logging
Setups you passed on: a trade that looked plausible but you skipped — log it and its outcome. Did it work (you missed a winner — was your filter too strict?) or fail (good pass — your judgment was right)? Over time this calibrates your selectivity. Impulses you resisted: the one-more-trade you didn't take, the revenge trade you walked away from, the flat day you protected. Logging these makes your discipline visible and reinforces it.
What it teaches
Tracking passed setups tells you whether your filters are well-calibrated — if the trades you skip mostly would have lost, your discipline is sound; if they mostly would have won, you may be too timid or filtering wrong. Tracking resisted impulses builds a record of good self-control you can see and take credit for, which strengthens the habit (discipline you can point to is discipline you repeat). Both turn invisible non-actions into feedback.
The winner you skipped and the disaster you didn't take are both decisions. A journal that only logs what you did is blind to half your judgment.
Keeping it light
This can't be burdensome or you won't do it — a quick note is enough: “passed OR-break, too extended, right call” or “wanted to revenge-trade the 10:30 loss, walked away.” Fold it into your emotional ledger and review it in the weekly ritual alongside your actual trades. It's a small habit with an outsized payoff: it makes your process, including the part where you did nothing, something you can see and improve.