diff --git a/scripts/generate_aviti_run_manifest.py b/scripts/generate_aviti_run_manifest.py
index 8992dba3..afd1ef02 100644
--- a/scripts/generate_aviti_run_manifest.py
+++ b/scripts/generate_aviti_run_manifest.py
@@ -81,25 +81,27 @@ def idxs_from_label(label: str) -> list[str | tuple[str, str]]:
     """
 
     # Initialize result
-    idxs = []
+    idxs: list[str | tuple[str, str]] = []
 
     # Expand 10X single indexes
     if TENX_SINGLE_PAT.findall(label):
-        match = TENX_SINGLE_PAT.findall(label)[0]
+        match: str = TENX_SINGLE_PAT.findall(label)[0]
         for tenXidx in Chromium_10X_indexes[match]:
             idxs.append(tenXidx)
     # Case of 10X dual indexes
     elif TENX_DUAL_PAT.findall(label):
-        match = TENX_DUAL_PAT.findall(label)[0]
-        i7_idx = Chromium_10X_indexes[match][0]
-        i5_idx = Chromium_10X_indexes[match][1]
-        idxs.append((i7_idx, revcomp(i5_idx)))
+        match: str = TENX_DUAL_PAT.findall(label)[0]
+        i7_idx: str = Chromium_10X_indexes[match][0]
+        i5_idx: str = Chromium_10X_indexes[match][1]
+        pair: tuple[str, str] = (i7_idx, revcomp(i5_idx))
+        idxs.append(pair)
     # Case of SS3 indexes
     elif SMARTSEQ_PAT.findall(label):
-        match = SMARTSEQ_PAT.findall(label)[0]
+        match: str = SMARTSEQ_PAT.findall(label)[0]
         for i7_idx in SMARTSEQ3_INDEXES[match][0]:
             for i5_idx in SMARTSEQ3_INDEXES[match][1]:
-                idxs.append((i7_idx, revcomp(i5_idx)))
+                pair: tuple[str, str] = (i7_idx, revcomp(i5_idx))
+                idxs.append(pair)
     # NoIndex cases
     elif label.replace(",", "").upper() == "NOINDEX" or (
         label.replace(",", "").upper() == ""
@@ -107,12 +109,14 @@ def idxs_from_label(label: str) -> list[str | tuple[str, str]]:
         raise AssertionError("NoIndex cases not allowed.")
     # Ordinary indexes
     elif IDX_PAT.findall(label):
-        match = IDX_PAT.findall(label)[0]
+        match: str = IDX_PAT.findall(label)[0]
         if "-" in match:
-            idx1, idx2 = match.split("-")
-            idxs.append((idx1, revcomp(idx2)))
+            idx1: str = match.split("-")[0]
+            idx2: str = match.split("-")[1]
+            pair: tuple[str, str] = (idx1, idx2)
+            idxs.append(pair)
         else:
-            idx1 = match
+            idx1: str = match
             idxs.append(idx1)
     else:
         raise AssertionError(f"Could not parse index from '{label}'.")