diff --git a/include/grpc++/time.h b/include/grpc++/time.h
index 1fc4ad7..ffcba4e 100644
--- a/include/grpc++/time.h
+++ b/include/grpc++/time.h
@@ -40,13 +40,13 @@
 
 /* If you are trying to use CompletionQueue::AsyncNext with a time class that
    isn't either gpr_timespec or std::chrono::system_clock::time_point, you
-   will most likely be looking at that comment as your compiler will have
-   fired an error below. In order to fix that issue, you have two potential
+   will most likely be looking at this comment as your compiler will have
+   fired an error below. In order to fix this issue, you have two potential
    solutions:
 
      1. Use gpr_timespec or std::chrono::system_clock::time_point instead
      2. Specialize the TimePoint class with whichever time class that you
-        want to use here. See below for two examples of how to do that.
+        want to use here. See below for two examples of how to do this.
  */
 
 template <typename T>
diff --git a/src/cpp/client/secure_credentials.cc b/src/cpp/client/secure_credentials.cc
index 9e83ac8..48bf743 100644
--- a/src/cpp/client/secure_credentials.cc
+++ b/src/cpp/client/secure_credentials.cc
@@ -81,27 +81,27 @@
 // Builds service account credentials.
 std::unique_ptr<Credentials> ServiceAccountCredentials(
     const grpc::string& json_key, const grpc::string& scope,
-    long token_lifetime) {
-  if (token_lifetime <= 0) {
+    long token_lifetime_seconds) {
+  if (token_lifetime_seconds <= 0) {
     gpr_log(GPR_ERROR,
             "Trying to create ServiceAccountCredentials "
             "with non-positive lifetime");
     return WrapCredentials(nullptr);
   }
-  gpr_timespec lifetime = gpr_time_from_seconds(token_lifetime);
+  gpr_timespec lifetime = gpr_time_from_seconds(token_lifetime_seconds);
   return WrapCredentials(grpc_service_account_credentials_create(
       json_key.c_str(), scope.c_str(), lifetime));
 }
 
 // Builds JWT credentials.
 std::unique_ptr<Credentials> JWTCredentials(
-    const grpc::string& json_key, long token_lifetime) {
-  if (token_lifetime <= 0) {
+    const grpc::string& json_key, long token_lifetime_seconds) {
+  if (token_lifetime_seconds <= 0) {
     gpr_log(GPR_ERROR,
             "Trying to create JWTCredentials with non-positive lifetime");
     return WrapCredentials(nullptr);
   }
-  gpr_timespec lifetime = gpr_time_from_seconds(token_lifetime);
+  gpr_timespec lifetime = gpr_time_from_seconds(token_lifetime_seconds);
   return WrapCredentials(
       grpc_jwt_credentials_create(json_key.c_str(), lifetime));
 }