diff --git a/src/system_info.c b/src/system_info.c
index 97957f8..898a042 100644
--- a/src/system_info.c
+++ b/src/system_info.c
@@ -436,7 +436,7 @@ int get_processes(struct fast_process_info **processes, int *count)
                 break;
             }
         }
-        if (i < len)
+        if (i < len)  //not digital string
         {
             continue;
         }
diff --git a/src/system_info.h b/src/system_info.h
index 664639d..513749f 100644
--- a/src/system_info.h
+++ b/src/system_info.h
@@ -48,7 +48,7 @@ extern "C" {
 
 #ifdef OS_LINUX
    typedef struct fast_process_info {
-       int field_count;
+       int field_count;  //field count in /proc/$pid/stat
        int pid;
        char comm[128];
        char state;
diff --git a/src/tests/test_mblock.c b/src/tests/test_mblock.c
index 2b42db6..419ef10 100644
--- a/src/tests/test_mblock.c
+++ b/src/tests/test_mblock.c
@@ -85,6 +85,7 @@ int main(int argc, char *argv[])
                 stats[i].f_ffree);
     }
 
+#ifdef OS_LINUX
     {
         FastProcessInfo *processes;
         get_processes(&processes, &count);
@@ -93,7 +94,12 @@ int main(int argc, char *argv[])
         {
             printf("%d %d %c %s\n", processes[i].field_count, processes[i].pid, processes[i].state, processes[i].comm);
         }
+        if (processes != NULL)
+        {
+            free(processes);
+        }
     }
+#endif
 
     //iniPrintItems(&iniContext);
     iniFreeContext(&iniContext);