1 files changed, 7 insertions, 0 deletions
diff --git a/README.md b/README.md
index cf617d0..f57ab04 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,13 @@ operations `<=`, `>=`:
     (<= +2 +4 +6.8 +6.8)      ; t
     (>= +4 +8)                ; f
 
+There is `+0` and `-0`, and their difference is only in their symbol. Their
+arithmetic values are the same; which is a positive zero. This equality is an
+arithmetic bug and expect it to endure. Although, this below remains possible:
+
+    (- +0)                    ; -0
+    (- -0)                    ; +0
+
 #### Random number operation
 
 `(random [number])` takes no or one number argument, returns a random number from