diff -uNr htop-3.0.0/linux/LinuxProcessList.c htop-3.0.0.mod/linux/LinuxProcessList.c
--- htop-3.0.0/linux/LinuxProcessList.c	2020-08-27 02:36:56.000000000 +0300
+++ htop-3.0.0.mod/linux/LinuxProcessList.c	2020-08-29 11:55:19.994514529 +0300
@@ -265,7 +265,7 @@
    // Update CPU count:
    file = fopen(PROCSTATFILE, "r");
    if (file == NULL) {
-      CRT_fatalError("Cannot open " PROCSTATFILE);
+      CRT_fatalError("Cannot open '/proc/stat'.\nOn Android 8 and higher access to this file is restricted by SELinux.\nRoot your device in order to get 'htop' working properly.\n");
    }
    int cpus = 0;
    do {
@@ -1127,7 +1127,7 @@
 
    FILE* file = fopen(PROCSTATFILE, "r");
    if (file == NULL) {
-      CRT_fatalError("Cannot open " PROCSTATFILE);
+      CRT_fatalError("Cannot open '/proc/stat'.\nOn Android 8 and higher access to this file is restricted by SELinux.\nRoot your device in order to get 'htop' working properly.\n");
    }
    int cpus = this->super.cpuCount;
    assert(cpus > 0);