diff --git a/src/tests.c b/src/tests.c
index c54465781b..85168bc5ca 100644
--- a/src/tests.c
+++ b/src/tests.c
@@ -4000,7 +4000,8 @@ void run_eckey_edge_case_test(void) {
     CHECK(secp256k1_ec_pubkey_tweak_mul(ctx, &pubkey, ctmp2) == 0);
     CHECK(memcmp(&pubkey, zeros, sizeof(pubkey)) == 0);
     memcpy(&pubkey, &pubkey2, sizeof(pubkey));
-    /* Overflowing key zeroizes */
+    /* If seckey_tweak_add or seckey_tweak_mul are called with an overflowing
+    seckey, the seckey is zeroized. */
     memcpy(ctmp, orderc, 32);
     memset(ctmp2, 0, 32);
     ctmp2[31] = 0x01;
@@ -4010,7 +4011,8 @@ void run_eckey_edge_case_test(void) {
     memcpy(ctmp, orderc, 32);
     CHECK(secp256k1_ec_seckey_tweak_mul(ctx, ctmp, ctmp2) == 0);
     CHECK(memcmp(zeros, ctmp, 32) == 0);
-    /* Overflowing key tweak zeroizes. */
+    /* If seckey_tweak_add or seckey_tweak_mul are called with an overflowing
+    tweak, the seckey is zeroized. */
     memcpy(ctmp, orderc, 32);
     ctmp[31] = 0x40;
     CHECK(secp256k1_ec_seckey_tweak_add(ctx, ctmp, orderc) == 0);
@@ -4021,6 +4023,8 @@ void run_eckey_edge_case_test(void) {
     CHECK(memcmp(zeros, ctmp, 32) == 0);
     memcpy(ctmp, orderc, 32);
     ctmp[31] = 0x40;
+    /* If pubkey_tweak_add or pubkey_tweak_mul are called with an overflowing
+    tweak, the pubkey is zeroized. */
     CHECK(secp256k1_ec_pubkey_tweak_add(ctx, &pubkey, orderc) == 0);
     CHECK(memcmp(&pubkey, zeros, sizeof(pubkey)) == 0);
     memcpy(&pubkey, &pubkey2, sizeof(pubkey));