diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index 4a5f8d20..ad3dc6de 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -703,6 +703,20 @@ function parseTSetNode(node: Element, ctx: ParsingContext): AST | null {
 // Components
 // -----------------------------------------------------------------------------
 
+// Error messages when trying to use an unsupported directive on a component
+const directiveErrorMap = new Map([
+  ["t-on", "t-on is no longer supported on components. Consider passing a callback in props."],
+  [
+    "t-ref",
+    "t-ref is no longer supported on components. Consider exposing only the public part of the component's API through a callback prop.",
+  ],
+  ["t-att", "t-att makes no sense on component: props are already treated as expressions"],
+  [
+    "t-attf",
+    "t-attf is not supported on components: use template strings for string interpolation in props",
+  ],
+]);
+
 function parseComponent(node: Element, ctx: ParsingContext): AST | null {
   let name = node.tagName;
   const firstLetter = name[0];
@@ -726,10 +740,9 @@ function parseComponent(node: Element, ctx: ParsingContext): AST | null {
   const props: ASTComponent["props"] = {};
   for (let name of node.getAttributeNames()) {
     const value = node.getAttribute(name)!;
-    if (name.startsWith("t-on-")) {
-      throw new Error(
-        "t-on is no longer supported on Component node. Consider passing a callback in props."
-      );
+    if (name.startsWith("t-")) {
+      const message = directiveErrorMap.get(name.split("-").slice(0, 2).join("-"));
+      throw new Error(message || `unsupported directive on Component: ${name}`);
     } else {
       props[name] = value;
     }
diff --git a/tests/compiler/parser.test.ts b/tests/compiler/parser.test.ts
index 1e46cdcc..489e932d 100644
--- a/tests/compiler/parser.test.ts
+++ b/tests/compiler/parser.test.ts
@@ -1069,7 +1069,31 @@ describe("qweb parser", () => {
 
   test("component with event handler", async () => {
     expect(() => parse(`<MyComponent t-on-click="someMethod"/>`)).toThrow(
-      "t-on is no longer supported on Component node. Consider passing a callback in props."
+      "t-on is no longer supported on components. Consider passing a callback in props."
+    );
+  });
+
+  test("component with t-ref", async () => {
+    expect(() => parse(`<MyComponent t-ref="something"/>`)).toThrow(
+      "t-ref is no longer supported on components. Consider exposing only the public part of the component's API through a callback prop."
+    );
+  });
+
+  test("component with t-att", async () => {
+    expect(() => parse(`<MyComponent t-att="something"/>`)).toThrow(
+      "t-att makes no sense on component: props are already treated as expressions"
+    );
+  });
+
+  test("component with t-attf", async () => {
+    expect(() => parse(`<MyComponent t-attf="something"/>`)).toThrow(
+      "t-attf is not supported on components: use template strings for string interpolation in props"
+    );
+  });
+
+  test("component with other unsupported directive", async () => {
+    expect(() => parse(`<MyComponent t-something="5"/>`)).toThrow(
+      "unsupported directive on Component: t-something"
     );
   });