diff --git a/backend/src/docmind/rag/service.py b/backend/src/docmind/rag/service.py
index 9546297..50e8651 100644
--- a/backend/src/docmind/rag/service.py
+++ b/backend/src/docmind/rag/service.py
@@ -13,7 +13,7 @@
 from docmind.text import best_sentence
 
 TitleLookup = Callable[[str, Sequence[str]], Awaitable[dict[str, str]]]
-_CITE = re.compile(r"\[(\d{1,2})\]")
+_CITE = re.compile(r"\[(\d{1,2}(?:\s*,\s*\d{1,2})*)\]")
 
 
 @dataclass(slots=True, frozen=True)
@@ -40,7 +40,7 @@ class DoneEvent:
 
 
 def cited_indices(answer: str, available: int) -> list[int]:
-    found = {int(m) for m in _CITE.findall(answer)}
+    found = {int(num) for group in _CITE.findall(answer) for num in group.split(",")}
     return sorted(i for i in found if 1 <= i <= available)
 
 
diff --git a/backend/tests/test_citations.py b/backend/tests/test_citations.py
new file mode 100644
index 0000000..0dbf193
--- /dev/null
+++ b/backend/tests/test_citations.py
@@ -0,0 +1,29 @@
+"""Unit tests for parsing citation markers out of an answer."""
+
+from __future__ import annotations
+
+from docmind.rag.service import cited_indices
+
+
+def test_separate_markers() -> None:
+    assert cited_indices("See [1] and also [2].", 2) == [1, 2]
+
+
+def test_repeated_bracket_markers() -> None:
+    assert cited_indices("Both [1][2] agree.", 2) == [1, 2]
+
+
+def test_grouped_marker() -> None:
+    assert cited_indices("Both sources [1, 2] agree.", 2) == [1, 2]
+
+
+def test_grouped_marker_without_spaces() -> None:
+    assert cited_indices("See [1,2,3].", 3) == [1, 2, 3]
+
+
+def test_grouped_marker_drops_out_of_range() -> None:
+    assert cited_indices("See [1, 5].", 2) == [1]
+
+
+def test_zero_and_out_of_range_ignored() -> None:
+    assert cited_indices("Nothing here: [0], [7].", 2) == []
diff --git a/frontend/src/components/AnswerText.test.tsx b/frontend/src/components/AnswerText.test.tsx
index cdc5b10..615bb74 100644
--- a/frontend/src/components/AnswerText.test.tsx
+++ b/frontend/src/components/AnswerText.test.tsx
@@ -19,6 +19,24 @@ describe('AnswerText', () => {
     expect(screen.getByText(/See \[0\] and/)).toBeInTheDocument()
   })
 
+  it('turns a grouped marker into one button per source', () => {
+    const onCite = vi.fn()
+    render(<AnswerText text="Both sources [1, 2] agree." available={2} onCite={onCite} />)
+    expect(citeButtons().map((b) => b.textContent)).toEqual(['1', '2'])
+  })
+
+  it('keeps out-of-range numbers in a group as text', () => {
+    render(<AnswerText text="See [1, 5]." available={2} />)
+    expect(citeButtons().map((b) => b.textContent)).toEqual(['1'])
+    expect(screen.getByText(/5/)).toBeInTheDocument()
+  })
+
+  it('keeps a fully out-of-range group as literal text', () => {
+    render(<AnswerText text="See [0, 9]." available={2} />)
+    expect(citeButtons()).toHaveLength(0)
+    expect(screen.getByText(/See \[0, 9\]\./)).toBeInTheDocument()
+  })
+
   it('reports the clicked source number', async () => {
     const onCite = vi.fn()
     render(<AnswerText text="Budget is 1,000 EUR [2]." available={2} onCite={onCite} />)
diff --git a/frontend/src/components/AnswerText.tsx b/frontend/src/components/AnswerText.tsx
index 2c825b8..d6cc266 100644
--- a/frontend/src/components/AnswerText.tsx
+++ b/frontend/src/components/AnswerText.tsx
@@ -6,7 +6,7 @@ interface Props {
   available?: number
 }
 
-const INLINE = /(\[\d{1,2}\])|(\*\*[^*]+\*\*)|(`[^`]+`)|(_[^_\n]+_)/g
+const INLINE = /(\[\d{1,2}(?:\s*,\s*\d{1,2})*\])|(\*\*[^*]+\*\*)|(`[^`]+`)|(_[^_\n]+_)/g
 
 /**
  * Tiny, safe Markdown subset renderer: paragraphs, lists, bold/italic/code and [n] citations.
@@ -53,22 +53,31 @@ function renderInline(text: string, onCite: Props['onCite'], available: number):
     if (start > last) out.push(text.slice(last, start))
     const token = match[0]
     if (match[1]) {
-      const n = Number(token.slice(1, -1))
-      out.push(
-        n >= 1 && n <= available ? (
-          <button
-            key={start}
-            type="button"
-            onClick={() => onCite?.(n)}
-            className="mx-0.5 inline-flex h-5 min-w-5 items-center justify-center rounded-md bg-indigo-100 px-1 align-text-top text-[11px] font-semibold text-indigo-700 transition hover:bg-indigo-600 hover:text-white dark:bg-indigo-500/20 dark:text-indigo-200"
-            aria-label={`Show source ${n}`}
-          >
-            {n}
-          </button>
-        ) : (
-          token
-        ),
-      )
+      // A citation can list several sources in one pair of brackets, e.g. [1, 2].
+      const nums = token.slice(1, -1).split(',').map((part) => Number(part.trim()))
+      const inRange = (n: number) => n >= 1 && n <= available
+      if (!nums.some(inRange)) {
+        out.push(token)
+      } else {
+        nums.forEach((n, i) => {
+          if (i > 0) out.push(', ')
+          out.push(
+            inRange(n) ? (
+              <button
+                key={`${start}-${i}`}
+                type="button"
+                onClick={() => onCite?.(n)}
+                className="mx-0.5 inline-flex h-5 min-w-5 items-center justify-center rounded-md bg-indigo-100 px-1 align-text-top text-[11px] font-semibold text-indigo-700 transition hover:bg-indigo-600 hover:text-white dark:bg-indigo-500/20 dark:text-indigo-200"
+                aria-label={`Show source ${n}`}
+              >
+                {n}
+              </button>
+            ) : (
+              String(n)
+            ),
+          )
+        })
+      }
     } else if (match[2]) {
       out.push(<strong key={start}>{token.slice(2, -2)}</strong>)
     } else if (match[3]) {