diff --git a/libc/docs/CHANGES.TXT b/libc/docs/CHANGES.TXT
index 3fbbee0..98b7fcf 100644
--- a/libc/docs/CHANGES.TXT
+++ b/libc/docs/CHANGES.TXT
@@ -16,6 +16,9 @@
 
 - <unistd.h>: Add ftruncate64().
 
+- <signal.h>: Changed the definition of SIGRTMAX to 64. However, note that
+  sigset_t is only 32-bit and cannot deal with real-time signals.
+
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 Differences between Android 2.3 and Android 2.2: