diff --git a/SignalServiceKit/src/Util/Cryptography.m b/SignalServiceKit/src/Util/Cryptography.m
index bcf446186..aa3f6ccac 100755
--- a/SignalServiceKit/src/Util/Cryptography.m
+++ b/SignalServiceKit/src/Util/Cryptography.m
@@ -816,6 +816,7 @@ const NSUInteger kAES256_KeyByteLength = 32;
 
 + (void)seedRandom
 {
+    // We should never use rand(), but seed it just in case it's used by 3rd-party code
     unsigned seed = [Cryptography randomUnsigned];
     srand(seed);
 }