diff --git a/README.md b/README.md
index e5d2fd95..f6ad6dca 100644
--- a/README.md
+++ b/README.md
@@ -122,7 +122,7 @@ Then embed the cards in your `README.md`:
 | `tz`               | `UTC`                            | IANA tz for the productive-time card (e.g. `Asia/Saigon`)               |
 | `start_of_week`    | `sunday`                         | First day of week for heatmap rows and weekday bars (`sunday`…`saturday`) |
 | `top_repos`        | `0`                              | Optional cap on seed repos probed for commit history (`0` = unlimited)  |
-| `commits_per_repo` | `500`                            | Max commits sampled per repo (covers last-year and all-time aggregates) |
+| `commits_per_repo` | `500`                            | Max commits sampled per repo, `0` = every commit (covers last-year and all-time aggregates) |
 | `include_forks`    | `true`                           | Include forked repos in stats and commit probing                        |
 | `include_private`  | `true`                           | Include private repos (requires PAT with `repo` scope; silently no-op otherwise) |
 | `include_org_repos`| `false`                          | Count org-owned repos you administer toward stars, repo count, languages, top-starred (needs `read:org`) |
@@ -168,7 +168,7 @@ ghstats -user tiennm99 -themes dracula -include-org-repos -out output
 | `-tz`               | `Local`         | IANA timezone for productive-time cards                                |
 | `-start-of-week`    | `sunday`        | First day of week for heatmap rows and weekday bars (`sunday`…`saturday`) |
 | `-top-repos`        | `0`             | Optional cap on seed repos probed (`0` = unlimited)                    |
-| `-commits-per-repo` | `500`           | Max commits sampled per repo                                           |
+| `-commits-per-repo` | `500`           | Max commits sampled per repo, `0` = every commit                       |
 | `-include-forks`    | `true`          | Include forked repos in the stats                                      |
 | `-include-private`  | `true`          | Include private repos (requires `repo` PAT scope; silently no-op otherwise) |
 | `-include-org-repos`| `false`         | Count org-owned repos you administer toward stars, repo count, languages, top-starred |
diff --git a/action.yml b/action.yml
index 2bcc0d96..c20b92ca 100644
--- a/action.yml
+++ b/action.yml
@@ -36,7 +36,7 @@ inputs:
     required: false
     default: "0"
   commits_per_repo:
-    description: Max commits sampled per repo (covers last-year and all-time aggregates)
+    description: Max commits sampled per repo, `0` for every commit (covers last-year and all-time aggregates)
     required: false
     default: "500"
   include_forks:
diff --git a/docs/system-architecture.md b/docs/system-architecture.md
index 9bc74e7f..7ae9eed5 100644
--- a/docs/system-architecture.md
+++ b/docs/system-architecture.md
@@ -49,7 +49,7 @@ FetchContributionsAllTime(ctx, profile, opts)
   │          TotalCommitsAllTime
   │
   ▼
-FetchProductive(ctx, profile, profile.SeedRepos, loc, commitsPerRepo)
+FetchProductive(ctx, profile, profile.SeedRepos, loc, commitsPerRepo)  // 0 = no cap
   │  commitHistoryQuery × (#seeds × pages)
   │  per commit: t = committedDate in loc
   │              ProductiveAllTime[t.Hour]++
diff --git a/internal/github/commit_cap_test.go b/internal/github/commit_cap_test.go
new file mode 100644
index 00000000..09723a09
--- /dev/null
+++ b/internal/github/commit_cap_test.go
@@ -0,0 +1,27 @@
+package github
+
+import "testing"
+
+func TestReachedCommitCap(t *testing.T) {
+	cases := []struct {
+		name       string
+		seen       int
+		maxPerRepo int
+		want       bool
+	}{
+		{"under the cap", 100, 500, false},
+		{"at the cap", 500, 500, true},
+		{"past the cap", 700, 500, true},
+		// Zero means unlimited, so even a fresh repo keeps paginating. The
+		// old behavior stopped here and rendered empty commit-derived cards.
+		{"zero cap, nothing seen yet", 0, 0, false},
+		{"zero cap, deep into history", 100_000, 0, false},
+		{"negative cap treated as unlimited", 10, -1, false},
+	}
+	for _, tc := range cases {
+		if got := reachedCommitCap(tc.seen, tc.maxPerRepo); got != tc.want {
+			t.Errorf("%s: reachedCommitCap(%d, %d) = %v, want %v",
+				tc.name, tc.seen, tc.maxPerRepo, got, tc.want)
+		}
+	}
+}
diff --git a/internal/github/productive.go b/internal/github/productive.go
index c5749f25..dc8e86bc 100644
--- a/internal/github/productive.go
+++ b/internal/github/productive.go
@@ -30,9 +30,21 @@ type productiveGQL struct {
 // magnitude is irrelevant because the card renders percentages.
 const scaleFactor = 10_000
 
+// reachedCommitCap reports whether a repo has given up enough commits to stop
+// paginating. A cap of zero or less means no cap — keep going until the
+// history runs out — matching how -top-repos treats zero. Without the guard a
+// zero cap would stop before the first page and quietly empty every
+// commit-derived card.
+func reachedCommitCap(seen, maxPerRepo int) bool {
+	if maxPerRepo <= 0 {
+		return false
+	}
+	return seen >= maxPerRepo
+}
+
 // FetchProductive paginates the default-branch commit history (authored by
-// the target user) for each repo up to maxPerRepo commits, and fills two
-// parallel sets of aggregates on the Profile:
+// the target user) for each repo up to maxPerRepo commits (0 = all), and
+// fills two parallel sets of aggregates on the Profile:
 //
 //   - Last-year: p.Productive (24h histogram) and p.CommitsByLanguage
 //   - All-time:  p.ProductiveAllTime and p.CommitsByLanguageAllTime
@@ -62,7 +74,7 @@ func (c *Client) FetchProductive(ctx context.Context, p *Profile, repos []RepoIn
 		var cursor *string
 		seen := 0
 		for {
-			if seen >= maxPerRepo {
+			if reachedCommitCap(seen, maxPerRepo) {
 				break
 			}
 			owner := repo.Owner
diff --git a/main.go b/main.go
index 1767be16..47f69c03 100644
--- a/main.go
+++ b/main.go
@@ -24,7 +24,7 @@ func main() {
 		themesFlag     = flag.String("themes", "dracula", "comma-separated theme ids, or 'all'")
 		tzName         = flag.String("tz", "Local", "timezone for productive-time card (IANA name, e.g. Asia/Saigon)")
 		topRepos       = flag.Int("top-repos", 0, "optional cap on seed repos probed for commit history (0 = unlimited)")
-		perRepo        = flag.Int("commits-per-repo", 500, "max commits sampled per repo (covers both last-year and all-time aggregates)")
+		perRepo        = flag.Int("commits-per-repo", 500, "max commits sampled per repo, 0 = every commit (covers both last-year and all-time aggregates)")
 		includeForks   = flag.Bool("include-forks", true, "include forked repos in stats and commit probing")
 		includePrivate = flag.Bool("include-private", true, "include private repos (requires PAT with repo scope; silently no-op otherwise)")
 		includeOrgs    = flag.Bool("include-org-repos", false, "count org-owned repos you administer toward stars, repo count, repos-per-language and top-starred")