From: Ramakrishnan Muthukrishnan <vu3rdd@gmail.com>
Date: Sat, 23 Apr 2011 13:49:04 +0000 (+0530)
Subject: Add a more detailed explanation.
X-Git-Url: https://git.rkrishnan.org/posts/2013-10-25-new-blog.html?a=commitdiff_plain;h=af96895682a2ce21d85d9fa5a25d1caafc050430;p=sicp.git

Add a more detailed explanation.
---

diff --git a/src/sicp/ex3_31.rkt b/src/sicp/ex3_31.rkt
index 4b78357..fae2074 100644
--- a/src/sicp/ex3_31.rkt
+++ b/src/sicp/ex3_31.rkt
@@ -16,6 +16,10 @@ Let us take half adder example:
     (and-gate d e s)
     'ok))
 
+The gate procedures like inverter and or-gate calls add-action! which
+is the procedure which adds the gate operation to the agenda. If it
+is not called once, then the operation is not added into the agenda.
+
 If accept-action-proc! is defined without the call to proc, i.e.
 
 (define (accept-action-proc! proc)