diff --git a/.changeset/kind-ducks-compare.md b/.changeset/kind-ducks-compare.md
new file mode 100644
index 0000000..b3c6536
--- /dev/null
+++ b/.changeset/kind-ducks-compare.md
@@ -0,0 +1,5 @@
+---
+"@arethetypeswrong/cli": patch
+---
+
+Fix warning message json-format suggestion to use proper syntax
diff --git a/packages/cli/src/render/typed.ts b/packages/cli/src/render/typed.ts
index eb17079..f2b10fd 100644
--- a/packages/cli/src/render/typed.ts
+++ b/packages/cli/src/render/typed.ts
@@ -49,7 +49,7 @@ export async function typed(
     const summaryTexts = Object.keys(grouped).map((kind) => {
       const info = problemKindInfo[kind as core.ProblemKind];
       const description = marked(
-        `${info.description}${info.details ? ` Use \`--json\` to see ${info.details}.` : ""} ${info.docsUrl}`,
+        `${info.description}${info.details ? ` Use \`-f json\` to see ${info.details}.` : ""} ${info.docsUrl}`,
       );
       return `${emoji ? `${info.emoji} ` : ""}${description}`;
     });