diff --git a/setup.py b/setup.py
index adf24ba36..56991fb51 100644
--- a/setup.py
+++ b/setup.py
@@ -50,6 +50,25 @@ DENEB = 'deneb'
 EIP6110 = 'eip6110'
 WHISK = 'whisk'
 
+PREVIOUS_FORK_OF = {
+    PHASE0: None,
+    ALTAIR: PHASE0,
+    BELLATRIX: ALTAIR,
+    CAPELLA: BELLATRIX,
+    DENEB: CAPELLA,
+    EIP6110: DENEB,
+    WHISK: CAPELLA,
+}
+
+ALL_FORKS = list(PREVIOUS_FORK_OF.keys())
+
+IGNORE_SPEC_FILES = [
+    "specs/phase0/deposit-contract.md"
+]
+
+EXTRA_SPEC_FILES = {
+    BELLATRIX: "sync/optimistic.md"
+}
 
 # The helper functions that are used when defining constants
 CONSTANT_DEP_SUNDRY_CONSTANTS_FUNCTIONS = '''
@@ -96,6 +115,30 @@ class SpecObject(NamedTuple):
     dataclasses: Dict[str, str]
 
 
+def is_post_fork(a, b) -> bool:
+    """
+    Returns true if fork a is after b, or if a == b
+    """
+    if a == b:
+        return True
+
+    prev_fork = PREVIOUS_FORK_OF[a]
+    if prev_fork == b:
+        return True
+    elif prev_fork == None:
+        return False
+    else:
+        return is_post_fork(prev_fork, b)
+
+def get_fork_directory(fork):
+    dir1 = f'specs/{fork}'
+    if os.path.exists(dir1):
+        return dir1
+    dir2 = f'specs/_features/{fork}'
+    if os.path.exists(dir2):
+        return dir2
+    raise FileNotFoundError(f"No directory found for fork: {fork}")
+
 def _get_name_from_heading(heading: Heading) -> Optional[str]:
     last_child = heading.children[-1]
     if isinstance(last_child, CodeSpan):
@@ -1068,70 +1111,20 @@ class PySpecCommand(Command):
         if len(self.md_doc_paths) == 0:
             print("no paths were specified, using default markdown file paths for pyspec"
                   " build (spec fork: %s)" % self.spec_fork)
-            if self.spec_fork in (PHASE0, ALTAIR, BELLATRIX, CAPELLA, DENEB, EIP6110, WHISK):
-                self.md_doc_paths = """
-                    specs/phase0/beacon-chain.md
-                    specs/phase0/fork-choice.md
-                    specs/phase0/validator.md
-                    specs/phase0/weak-subjectivity.md
-                    specs/phase0/p2p-interface.md
-                """
-            if self.spec_fork in (ALTAIR, BELLATRIX, CAPELLA, DENEB, EIP6110, WHISK):
-                self.md_doc_paths += """
-                    specs/altair/light-client/full-node.md
-                    specs/altair/light-client/light-client.md
-                    specs/altair/light-client/p2p-interface.md
-                    specs/altair/light-client/sync-protocol.md
-                    specs/altair/beacon-chain.md
-                    specs/altair/bls.md
-                    specs/altair/fork.md
-                    specs/altair/validator.md
-                    specs/altair/p2p-interface.md
-                """
-            if self.spec_fork in (BELLATRIX, CAPELLA, DENEB, EIP6110, WHISK):
-                self.md_doc_paths += """
-                    specs/bellatrix/beacon-chain.md
-                    specs/bellatrix/fork.md
-                    specs/bellatrix/fork-choice.md
-                    specs/bellatrix/validator.md
-                    specs/bellatrix/p2p-interface.md
-                    sync/optimistic.md
-                """
-            if self.spec_fork in (CAPELLA, DENEB, EIP6110, WHISK):
-                self.md_doc_paths += """
-                    specs/capella/light-client/fork.md
-                    specs/capella/light-client/full-node.md
-                    specs/capella/light-client/p2p-interface.md
-                    specs/capella/light-client/sync-protocol.md
-                    specs/capella/beacon-chain.md
-                    specs/capella/fork.md
-                    specs/capella/fork-choice.md
-                    specs/capella/validator.md
-                    specs/capella/p2p-interface.md
-                """
-            if self.spec_fork in (DENEB, EIP6110):
-                self.md_doc_paths += """
-                    specs/deneb/light-client/fork.md
-                    specs/deneb/light-client/full-node.md
-                    specs/deneb/light-client/p2p-interface.md
-                    specs/deneb/light-client/sync-protocol.md
-                    specs/deneb/beacon-chain.md
-                    specs/deneb/fork.md
-                    specs/deneb/fork-choice.md
-                    specs/deneb/polynomial-commitments.md
-                    specs/deneb/p2p-interface.md
-                    specs/deneb/validator.md
-                """
-            if self.spec_fork == EIP6110:
-                self.md_doc_paths += """
-                    specs/_features/eip6110/beacon-chain.md
-                    specs/_features/eip6110/fork.md
-                """
-            if self.spec_fork == WHISK:
-                self.md_doc_paths += """
-                    specs/_features/whisk/beacon-chain.md
-                    specs/_features/whisk/fork.md
-                """
+            self.md_doc_paths = ""
+
+            for fork in ALL_FORKS:
+                if is_post_fork(self.spec_fork, fork):
+                    # Append all files in fork directory recursively
+                    for root, dirs, files in os.walk(get_fork_directory(fork)):
+                        for filename in files:
+                            filepath = os.path.join(root, filename)
+                            if filepath.endswith('.md') and filepath not in IGNORE_SPEC_FILES:
+                                self.md_doc_paths += filepath + "\n"
+                    # Append extra files if any
+                    if fork in EXTRA_SPEC_FILES:
+                        self.md_doc_paths += EXTRA_SPEC_FILES[fork] + "\n"
+
             if len(self.md_doc_paths) == 0:
                 raise Exception('no markdown files specified, and spec fork "%s" is unknown', self.spec_fork)