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 # Pillow-SIMD
 
-Pillow-SIMD is "following" [Pillow][original-docs].
-Pillow-SIMD versions are 100% compatible
+Pillow-SIMD is highly optimized version of [Pillow library][original-docs]
+for x86 architecture (mainly Intel and AMD CPUs).
+
+Pillow-SIMD is "following" Pillow which means it is
 drop-in replacements for Pillow of the same version.
 For example, `Pillow-SIMD 3.2.0.post3` is a drop-in replacement for
 `Pillow 3.2.0`, and  `Pillow-SIMD 3.3.3.post0` — for `Pillow 3.3.3`.