Make task description more clear on request from Ruslan Namazov

0-limit-crawler/README.md

@@ -1,11 +1,18 @@
 # Limit your crawler
 
-Given is a crawler (modified from the Go tour), which would pull pages excessively. The task is to modify the `main.go` file, so that
+Given is a crawler (modified from the Go tour) that requests pages
+excessively. However, we don't want to burden the webserver too
+much. Your task is to change the code to limit the crawler to at most
+one page per second, while maintaining concurrency (in other words,
+Crawl() must be called concurrently)
 
- - the crawler cannot crawl more than 2 pages per second
- - without losing it's concurrency
+## Hint
 
-# Test your solution
+This exercise can be solved in 3 lines only. If you can't do
+it, have a look at this:
+https://github.com/golang/go/wiki/RateLimiting
+
+## Test your solution
 
 Use `go test` to verify if your solution is correct.
 

0-limit-crawler/main.go

@@ -1,9 +1,10 @@
 //////////////////////////////////////////////////////////////////////
 //
-// Your task is to change the code to limit the crawler so that it is
-// not possible fo the crawler to crawl more than one page per second.
+// Your task is to change the code to limit the crawler to at most one
+// page per second, while maintaining concurrency (in other words,
+// Crawl() must be called concurrently)
 //
-// @hint: you can archive that by adding 3 lines
+// @hint: you can archive this by adding 3 lines
 //
 
 package main
@@ -32,6 +33,8 @@ func Crawl(url string, depth int, wg *sync.WaitGroup) {
 
 	wg.Add(len(urls))
 	for _, u := range urls {
+		// Do not remove the `go` keyword, as Crawl() must be
+		// called concurrently
 		go Crawl(u, depth-1, wg)
 	}
 	return