diff --git a/gen_pc_sidecar.php b/gen_pc_sidecar.php
index 8703b7a..b6385ce 100755
--- a/gen_pc_sidecar.php
+++ b/gen_pc_sidecar.php
@@ -91,7 +91,7 @@ function filter_extensions(array &$pbdb): null {
   }
 }
 
-function blacklist_terms(array &$pbdb): null {
+function blacklist_terms(array &$pbdb): bool {
   global $BLACKLISTED_TERMS;
   
   $pbdb = array_values(array_filter($pbdb, function ($item) use ($BLACKLISTED_TERMS) {
@@ -110,7 +110,7 @@ function blacklist_terms(array &$pbdb): null {
   }));
 }
 
-function whitelist_extension_filter(array &$pbdb): null {
+function whitelist_extension_filter(array &$pbdb): bool {
   global $EXTENSION_FILTER_LIST;
    
   $allowed = array_fill_keys(