diff --git a/elf.h b/elf.h
index da852a9..28bbd23 100644
--- a/elf.h
+++ b/elf.h
@@ -41,3 +41,20 @@ struct proghdr {
 #define ELF_PROG_FLAG_WRITE     2
 #define ELF_PROG_FLAG_READ      4
 
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diff --git a/fsvar.h b/fsvar.h
index 17bcb5b..43574b6 100644
--- a/fsvar.h
+++ b/fsvar.h
@@ -16,3 +16,43 @@ struct inode {
 
 #define I_BUSY 0x1
 #define I_VALID 0x2
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diff --git a/spinlock.h b/spinlock.h
index 1a706cf..31c3563 100644
--- a/spinlock.h
+++ b/spinlock.h
@@ -8,3 +8,47 @@ struct spinlock {
   uint pcs[10];  // The call stack (an array of program counters)
                  // that locked the lock.
 };
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