diff --git a/parser/README.md b/parser/README.md
index dc2dbe6..b548112 100644
--- a/parser/README.md
+++ b/parser/README.md
@@ -17,13 +17,26 @@ parser.evaluate({"a": [1, 1, 1], "b": [-5, -6, -9], "c": [6, 9, 20]}) # [2. 3. 4
 ```
 ## Expression syntax
 
-Expression can contain numbers or variable names with functions applyed to them, separated with operators or united with braces.
+Expression can contain numbers or variable names with functions applied to them, separated with operators or united with braces. Numbers do not support `*`-less multiplication with spaces. Variables must be separated by space.
+
+Here are examples with `_` as space
+
+| Wrong | Right |
+|--|--|
+| `2_a` | `2a` or `2*a` |
+| `a_2` | `a*2` |
+| `a_2_a` | `a*2*a` |
+| `2_cos(a)` | `2cos(a)` or `2*cos(a)` |
+| `cos(a)_2` | `cos(a)*2` |
+| `aa` | `a*a` or `a_a` |
+| - | `cos(a)cos(a)` or `cos(a)_cos(a)` or `cos(a)*cos(a)` |
+
 
 Theese are supported:
 
 Functions: 
 
-|name| math |
+| name | math |
 |--|--|
 | `abs` | $\|x\|$ |
 | `acos` | $\cos^{-1}(x)$ |