diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb236c1..d9e86a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## 0.3.1
+
+### Fixed
+
+- Foundry: after `forge build --build-info`, an edit and a plain `forge build`, the newer build info holds no compiler input and building again does not change that. slotdiff said "Build again"; it now says to run `forge build --build-info --force` or set `build_info = true`.
+- The `bin` path is `dist/bin.js`: npm 11 warned that it removed `./dist/bin.js` on publish (0.3.0 still installs its `slotdiff` command).
+
 ## 0.3.0
 
 ### Fixed
diff --git a/package.json b/package.json
index f18bf96..a61de9f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "slotdiff",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "description": "Storage layout diff for upgradeable Solidity contracts: compare a local build or a live deployment against another",
   "license": "MIT",
   "author": "Rohit Solia (https://github.com/rokso)",
@@ -16,7 +16,7 @@
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
   "bin": {
-    "slotdiff": "./dist/bin.js"
+    "slotdiff": "dist/bin.js"
   },
   "exports": {
     ".": {
diff --git a/src/build-info.ts b/src/build-info.ts
index d879f82..624a5ad 100644
--- a/src/build-info.ts
+++ b/src/build-info.ts
@@ -172,9 +172,15 @@ export async function findBuildInfo(
 
   if (fresh.length === 0) {
     throw new Error(
-      stale.length > 0
-        ? `Every build info holding ${contract} is older than the sources on disk. Build again.`
-        : `${contract} is no longer on disk (moved or deleted). Build again.`,
+      stale.length === 0
+        ? `${contract} is no longer on disk (moved or deleted). Build again.`
+        : withoutInput
+          ? // Forge then skips the unchanged files, so building again keeps the input out.
+            `Every build info holding ${contract} with its compiler input is older than the ` +
+            "sources on disk; newer build info holds no compiler input (built without " +
+            "`--build-info`). Run `forge build --build-info --force`, or set " +
+            "`build_info = true` in foundry.toml so every build keeps it."
+          : `Every build info holding ${contract} is older than the sources on disk. Build again.`,
     );
   }
 
diff --git a/test/build-info.test.ts b/test/build-info.test.ts
index 34976bf..124243d 100644
--- a/test/build-info.test.ts
+++ b/test/build-info.test.ts
@@ -126,6 +126,16 @@ describe("findBuildInfo", () => {
       await expect(findBuildInfo(root, "src/Vault.sol:Vault")).rejects.toThrow(/older than the/);
     });
 
+    // forge 1.8.3: `forge build --build-info`, an edit, then a plain `forge build`.
+    // Building again, even with --build-info, skips the unchanged files: only --force helps.
+    it("says how to get out of a stale build when newer builds hold no compiler input", async () => {
+      await put("out/build-info/a.json", foundry({ "src/Vault.sol": "old", "src/Base.sol": BASE }));
+      await put("out/build-info/b.json", { id: "b", source_id_to_path: { 0: "src/Vault.sol" } });
+      await expect(findBuildInfo(root, "src/Vault.sol:Vault")).rejects.toThrow(
+        /newer build info holds no compiler input.*`forge build --build-info --force`/,
+      );
+    });
+
     it("says a build of a moved or deleted target is gone", async () => {
       await put("out/build-info/a.json", foundry({ "src/Gone.sol": "x", "src/Base.sol": BASE }));
       await expect(findBuildInfo(root, "src/Gone.sol:Gone")).rejects.toThrow(/no longer on disk/);
diff --git a/test/package.test.ts b/test/package.test.ts
new file mode 100644
index 0000000..663506c
--- /dev/null
+++ b/test/package.test.ts
@@ -0,0 +1,14 @@
+/**
+ * The published manifest, as npm reads it on publish.
+ */
+import { describe, it, expect } from "vitest";
+import { readFile } from "node:fs/promises";
+
+describe("package.json", () => {
+  // npm 11 drops a bin path written as "./dist/bin.js" on publish ("script name
+  // ... was invalid and removed"), which would ship a package without the CLI.
+  it("names the CLI's file without a leading ./", async () => {
+    const pkg = JSON.parse(await readFile(new URL("../package.json", import.meta.url), "utf8"));
+    expect(pkg.bin).toEqual({ slotdiff: "dist/bin.js" });
+  });
+});