diff --git a/doc/format.html b/doc/format.html
index f0df84bd..295e3406 100644
--- a/doc/format.html
+++ b/doc/format.html
@@ -463,7 +463,7 @@
 				<5>
 			</TD>
 			<TD>
-				(bits per sample)-1.  FLAC supports from 1 to 32 bits per sample.  Currently the reference encoder and decoders only support up to 24 bits per sample.
+				(bits per sample)-1.  FLAC supports from 4 to 32 bits per sample.  Currently the reference encoder and decoders only support up to 24 bits per sample.
 			</TD>
 		</TR>
 		<TR>
diff --git a/include/FLAC/format.h b/include/FLAC/format.h
index 73698fac..f93eb105 100644
--- a/include/FLAC/format.h
+++ b/include/FLAC/format.h
@@ -26,6 +26,7 @@
 #define FLAC__MIN_BLOCK_SIZE (16u)
 #define FLAC__MAX_BLOCK_SIZE (65535u)
 #define FLAC__MAX_CHANNELS (8u)
+#define FLAC__MIN_BITS_PER_SAMPLE (4u)
 /*NOTE: only up to 24 because of the current predictor coefficient quantization and the fact we use int32s for all work */
 #define FLAC__MAX_BITS_PER_SAMPLE (24u)
 /* the following is ((2 ** 20) - 1) div 10 */