diff --git a/mempalace/entity_detector.py b/mempalace/entity_detector.py
index 85b54e8fec..16e438aa94 100644
--- a/mempalace/entity_detector.py
+++ b/mempalace/entity_detector.py
@@ -235,6 +235,13 @@ def _get_stopwords(languages: tuple) -> frozenset:
     ".rb",
     ".go",
     ".rs",
+    # C / C++
+    ".c",
+    ".h",
+    ".cpp",
+    ".hpp",
+    ".cc",
+    ".hh",
 }
 
 SKIP_DIRS = {
diff --git a/mempalace/miner.py b/mempalace/miner.py
index dda0c0e109..7f11cf6ea3 100644
--- a/mempalace/miner.py
+++ b/mempalace/miner.py
@@ -125,6 +125,13 @@ def _read_text_no_follow(filepath: Path, root: Path) -> Optional[str]:
     ".java",
     ".go",
     ".rs",
+    # C / C++
+    ".c",
+    ".h",
+    ".cpp",
+    ".hpp",
+    ".cc",
+    ".hh",
     ".swift",
     ".kt",
     ".kts",
diff --git a/tests/test_miner_c_cpp_visibility.py b/tests/test_miner_c_cpp_visibility.py
new file mode 100644
index 0000000000..9ceda2c4bb
--- /dev/null
+++ b/tests/test_miner_c_cpp_visibility.py
@@ -0,0 +1,34 @@
+"""C/C++ sources must not be silently skipped by the project miner.
+
+Same failure class as test_miner_jsonl_visibility.py: scan_project keeps
+only files whose suffix is in READABLE_EXTENSIONS. The whitelist grew
+per-stack (C#, PHP, Swift/Kotlin, LaTeX) but never gained C or C++, so
+mining any C project silently drops every .c/.h file — no warning, no
+log line.
+"""
+
+import tempfile
+from pathlib import Path
+
+from mempalace.miner import READABLE_EXTENSIONS, scan_project
+
+C_CPP_EXTENSIONS = {".c", ".h", ".cpp", ".hpp", ".cc", ".hh"}
+
+
+class TestCAndCppNotSilentlySkipped:
+    def test_c_cpp_in_readable_extensions(self):
+        missing = C_CPP_EXTENSIONS - READABLE_EXTENSIONS
+        assert not missing, (
+            f"READABLE_EXTENSIONS is missing C/C++ suffixes {sorted(missing)}; "
+            "every such file in a mined project is silently skipped."
+        )
+
+    def test_scan_project_picks_up_c_file(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            tmpdir = Path(tmp)
+            c_path = tmpdir / "probe.c"
+            c_path.write_text(
+                '#include <stdio.h>\nint main(void) { printf("hello\\n"); return 0; }\n'
+            )
+            found = [p.name for p in scan_project(str(tmpdir))]
+            assert "probe.c" in found, f"scan_project silently dropped probe.c. Returned: {found}"