diff --git a/llvm/test/tools/UpdateTestChecks/lit.local.cfg b/llvm/test/tools/UpdateTestChecks/lit.local.cfg
index a954eb7ba1740..7147769502a6f 100644
--- a/llvm/test/tools/UpdateTestChecks/lit.local.cfg
+++ b/llvm/test/tools/UpdateTestChecks/lit.local.cfg
@@ -10,7 +10,7 @@ except ImportError:
     from pipes import quote as shell_quote
 
 
-def add_update_script_substition(
+def add_update_script_substitution(
     name, python_exe=config.python_executable, extra_args=""
 ):
     assert name.startswith("%")
@@ -33,26 +33,26 @@ llc_path = os.path.join(config.llvm_tools_dir, "llc")
 if os.path.isfile(llc_path):
     config.available_features.add("llc-binary")
     llc_arg = "--llc-binary " + shell_quote(llc_path)
-    add_update_script_substition("%update_llc_test_checks", extra_args=llc_arg)
-    add_update_script_substition("%update_mir_test_checks", extra_args=llc_arg)
+    add_update_script_substitution("%update_llc_test_checks", extra_args=llc_arg)
+    add_update_script_substitution("%update_mir_test_checks", extra_args=llc_arg)
 
 opt_path = os.path.join(config.llvm_tools_dir, "opt")
 if os.path.isfile(opt_path):
     config.available_features.add("opt-binary")
     opt_arg = "--opt-binary " + shell_quote(opt_path)
-    add_update_script_substition("%update_test_checks", extra_args=opt_arg)
-    add_update_script_substition("%update_analyze_test_checks", extra_args=opt_arg)
+    add_update_script_substitution("%update_test_checks", extra_args=opt_arg)
+    add_update_script_substitution("%update_analyze_test_checks", extra_args=opt_arg)
 
 llvm_mca_path = os.path.join(config.llvm_tools_dir, "llvm-mca")
 if os.path.isfile(llvm_mca_path):
     config.available_features.add("llvm-mca-binary")
     mca_arg = "--llvm-mca-binary " + shell_quote(llvm_mca_path)
-    add_update_script_substition("%update_test_checks", extra_args=mca_arg)
+    add_update_script_substitution("%update_test_checks", extra_args=mca_arg)
 
 split_file_path = os.path.join(config.llvm_tools_dir, "split-file")
 if os.path.isfile(split_file_path):
-    add_update_script_substition("%update_test_body")
+    add_update_script_substitution("%update_test_body")
 
 llvm_mc_path = os.path.join(config.llvm_tools_dir, "llvm-mc")
 if os.path.isfile(llvm_mc_path):
-    add_update_script_substition("%update_mc_test_checks")
+    add_update_script_substitution("%update_mc_test_checks")
diff --git a/llvm/utils/UpdateTestChecks/common.py b/llvm/utils/UpdateTestChecks/common.py
index b108a21dbc52b..e1cc02e1a608c 100644
--- a/llvm/utils/UpdateTestChecks/common.py
+++ b/llvm/utils/UpdateTestChecks/common.py
@@ -1396,7 +1396,7 @@ def find_diff_matching(lhs: List[str], rhs: List[str]) -> List[tuple]:
             backlinks.append(None)
 
     # Commit to names in the matching by walking the backlinks. Recursively
-    # attempt to fill in more matches in-betweem.
+    # attempt to fill in more matches in-between.
     match_idx = table_candidate_idx[-1]
     while match_idx is not None:
         current = candidates[match_idx]