diff --git a/spec.md b/spec.md
index cf2c1e0..7624221 100644
--- a/spec.md
+++ b/spec.md
@@ -250,3 +250,4 @@ of `hbasm` syntax.
 - Registers are represented by `r` followed by the number (`r10`)
 - Labels are defined by label name followed with colon (`loop:`)
 - Labels are references simply by their name (`print`)
+- Immediates are entered plainly. Negative numbers supported.
\ No newline at end of file