1 files changed, 1 insertions, 0 deletions
diff --git a/lib/pure/uri.nim b/lib/pure/uri.nim
index dd8040928..d296017dd 100644
--- a/lib/pure/uri.nim
+++ b/lib/pure/uri.nim
@@ -60,6 +60,7 @@ proc encodeUrl*(s: string, usePlus=true): string =
   let fromSpace = if usePlus: "+" else: "%20"
   for c in s:
     case c
+    # https://tools.ietf.org/html/rfc3986#section-2.3
     of 'a'..'z', 'A'..'Z', '0'..'9', '-', '.', '_', '~': add(result, c)
     of ' ': add(result, fromSpace)
     else: