From d0f26aea4f87391af77f5911c3e2ae19891287c8 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Sat, 27 Feb 2016 14:13:32 -0500
Subject: signal: Add docstring for signal-if.

* sly/signal.scm (signal-if): Add docstring.
---
 sly/signal.scm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sly/signal.scm b/sly/signal.scm
index 41365a9..fc58b25 100644
--- a/sly/signal.scm
+++ b/sly/signal.scm
@@ -354,6 +354,9 @@ signal PRED is true, or the value of the signal OFF otherwise."
                      (list predicate)))
 
 (define-syntax-rule (signal-if predicate consequent alternate)
+  "Create a new signal whose value is the result of evaluating
+CONSEQUENT when the value of the signal PREDICATE is truth, otherwise
+ALTERNATE is evaluated."
   (signal-map (lambda (true?) (if true? consequent alternate)) predicate))
 
 (define (signal-constant constant signal)
-- 
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