diff --git a/.gitea/actions/review/action.yml b/.gitea/actions/review/action.yml
index d005697..0fdccdc 100644
--- a/.gitea/actions/review/action.yml
+++ b/.gitea/actions/review/action.yml
@@ -67,7 +67,7 @@ inputs:
     required: false
     default: 'false'
   update-existing:
-    description: 'Delete previous review from same bot before posting (default true)'
+    description: 'Delete previous review from same bot before posting. Accepts: true/1/yes or false/0/no (default true)'
     required: false
     default: 'true'
 
diff --git a/cmd/review-bot/main.go b/cmd/review-bot/main.go
index 39865b4..c9e414f 100644
--- a/cmd/review-bot/main.go
+++ b/cmd/review-bot/main.go
@@ -359,7 +359,7 @@ func envOrDefaultInt(key string, defaultVal int) int {
 }
 
 func envOrDefaultBool(key string, defaultVal bool) bool {
-	v := os.Getenv(key)
+	v := strings.TrimSpace(strings.ToLower(os.Getenv(key)))
 	if v == "" {
 		return defaultVal
 	}
diff --git a/gitea/client.go b/gitea/client.go
index f21b1d5..a77e111 100644
--- a/gitea/client.go
+++ b/gitea/client.go
@@ -298,7 +298,7 @@ func (c *Client) GetAuthenticatedUser(ctx context.Context) (string, error) {
 
 // ListReviews returns all reviews on a pull request.
 func (c *Client) ListReviews(ctx context.Context, owner, repo string, number int) ([]Review, error) {
-	reqURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/reviews",
+	reqURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/reviews?limit=50",
 		c.baseURL,
 		url.PathEscape(owner),
 		url.PathEscape(repo),
diff --git a/gitea/client_test.go b/gitea/client_test.go
index fc93473..7ca9b21 100644
--- a/gitea/client_test.go
+++ b/gitea/client_test.go
@@ -361,6 +361,9 @@ func TestListReviews(t *testing.T) {
 		if r.URL.Path != "/api/v1/repos/owner/repo/pulls/5/reviews" {
 			t.Errorf("unexpected path: %s", r.URL.Path)
 		}
+		if r.URL.Query().Get("limit") != "50" {
+			t.Errorf("expected limit=50, got %s", r.URL.Query().Get("limit"))
+		}
 		w.Header().Set("Content-Type", "application/json")
 		w.Write([]byte(`[{"id":10,"user":{"login":"bot-a"},"state":"APPROVED","stale":false},{"id":11,"user":{"login":"bot-b"},"state":"REQUEST_CHANGES","stale":true}]`))
 	}))