diff --git a/libc/arch-arm/include/machine/_types.h b/libc/arch-arm/include/machine/_types.h
index 6d10e12b4..3e779ca85 100644
--- a/libc/arch-arm/include/machine/_types.h
+++ b/libc/arch-arm/include/machine/_types.h
@@ -46,8 +46,6 @@ typedef long           ssize_t;
 typedef long           ptrdiff_t;
 #endif
 
-//#include <linux/types.h>
-
 /* 7.18.1.1 Exact-width integer types */
 typedef	__signed char		__int8_t;
 typedef	unsigned char		__uint8_t;
diff --git a/libc/include/pthread.h b/libc/include/pthread.h
index 2e1b281fb..a43e47c80 100644
--- a/libc/include/pthread.h
+++ b/libc/include/pthread.h
@@ -311,4 +311,4 @@ extern void  __pthread_cleanup_pop(__pthread_cleanup_t*  c,
 #define LONG_LONG_MAX __LONG_LONG_MAX__
 #define LONG_LONG_MIN (-__LONG_LONG_MAX__ - 1)
 
-#endif // _PTHREAD_H_
+#endif /* _PTHREAD_H_ */
diff --git a/libc/include/sys/file.h b/libc/include/sys/file.h
index 06937ffaa..cf2f4b142 100644
--- a/libc/include/sys/file.h
+++ b/libc/include/sys/file.h
@@ -31,7 +31,7 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 
-// ANDROID: needed for flock()
+/* ANDROID: needed for flock() */
 #include <unistd.h>
 #include <fcntl.h>
 
diff --git a/libc/include/sys/ioctl_compat.h b/libc/include/sys/ioctl_compat.h
index d79b67adb..cab5c80a5 100644
--- a/libc/include/sys/ioctl_compat.h
+++ b/libc/include/sys/ioctl_compat.h
@@ -39,8 +39,8 @@
 #ifndef _SYS_IOCTL_COMPAT_H_
 #define	_SYS_IOCTL_COMPAT_H_
 
-//#include <sys/ttychars.h>
-//#include <sys/ttydev.h>
+/*#include <sys/ttychars.h>*/
+/*#include <sys/ttydev.h>*/
 
 struct tchars {
 	char	t_intrc;	/* interrupt */
diff --git a/libc/include/sys/ptrace.h b/libc/include/sys/ptrace.h
index 78a057a0b..848416b64 100644
--- a/libc/include/sys/ptrace.h
+++ b/libc/include/sys/ptrace.h
@@ -30,7 +30,7 @@
 
 #include <sys/cdefs.h>
 #include <sys/types.h>
-// For all of the defines
+/* For all of the defines */
 #include <linux/ptrace.h>
 
 __BEGIN_DECLS
diff --git a/libc/include/utmp.h b/libc/include/utmp.h
index e362b4021..ffd3c925a 100644
--- a/libc/include/utmp.h
+++ b/libc/include/utmp.h
@@ -87,4 +87,4 @@ struct utmp* getutent();
 
 __END_DECLS
 
-#endif // _UTMP_H_
+#endif /* _UTMP_H_ */